Once you hit apply and ok you will now have a new menu item in your Tools menu called WebServer on Port 8010. They require running an elevated (administrator) command prompt. Connect and share knowledge within a single location that is structured and easy to search. Anyhow, I found following workaround. Since I was using the Visual Studio Web Server and i was having problems I configured my web application project to use IIS instead and it worked. Do you have any tips and tricks for turning pages while singing without swishing noise. Until yesterday everything was normal but today i try to lauch my application using Ctrl+F5 and i get the following error: Environment: Yeah. Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Does a creature's enters the battlefield ability trigger if the creature is exiled in response? Dmitri K 437 score:1 Thanks! For me with VS2019, faced this same issue on start running our project. The Visual Studio's localhost Web Server (or) Default Web Server is the file "WebDev.WebServer.exe". Then set the Base URL value to be. Which is really frustrating. The first thing I have tried is to to remove .vs folder from the project as I read about it somewhere here. Will Nondetection prevent an Alarm spell from triggering? Unable to launch the IIS Express Web server, Failed to register URL, Access is denied, ASP.NET 5 MVC: unable to connect to web server 'IIS Express', Visual Studio 2005: Unable to connect to visual studio's localhost web server, Typeset a chain of fiber bundles with a known largest total space, Space - falling faster than light? What are the differences between Visual Studio Code and Visual Studio? If you need to test two or more apps then you must register them in Azure AD individually as you would in production. Can lead-acid batteries be stored by removing the liquid from them? How to obtain this solution using ProductLog in Mathematica, found by Wolfram Alpha? 504), Mobile app infrastructure being decommissioned, Unable to connect to ASP.Net Development Server issue, Visual Studio 2017/IIS Express: Unable to connect to the configured development Web server, Web Site Administration Tool: Unable to connect to SQL Server database (using SQL Server Development Edition), The breakpoint will not currently be hit. when you load project defender will notify in notification unauthorized changes blocked. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. What is it supposed to do? For those of you using .Net Core 3.x and still struggling, like myself, I finally after days of searching found a hint to the problem https://weblog.west-wind.com/posts/2020/Jan/14/ASPNET-Core-IIS-InProcess-Hosting-Issues-in-NET-Core-31. Close Visual Studio, Start as Administrator. to http://localhost:57520/. C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root, And the Open the Visual Studio in Admin mode and run the program. Find centralized, trusted content and collaborate around the technologies you use most. I did a bunch of rediculous things like stopping Visual Studio and IIS Express, removing the .VS folder of the solution, then clear out %USERPROFILE%\Documents\IISExpress\config folder, then restarting everything. Visual Studio 2005. Is a potential juror protected for what they say during jury selection? However, when verifying before posting this answer, turning it back on did not cause a recurrence of the problem. I tried almost all the options above, none of them worked for my scenario. How can my Beastmaster ranger use its animal companion as a mount? thanks. Opening Visual Studio as administrator will fix the problem. Solution to "Unable to Launch the IIS Express Web Server" Sibeesh Venu; Updated date Sep 01, 2015; . rev2022.11.7.43014. Handling unprepared students as a Teaching Assistant. 504), Mobile app infrastructure being decommissioned, Unable to connect to ASP.Net Development Server issue, Visual Studio 2017/IIS Express: Unable to connect to the configured development Web server, A potentially dangerous Request.Form value was detected from the client. Connect and share knowledge within a single location that is structured and easy to search. Not sure how it occasionally gets fixed. Does subclassing int to forbid negative integers break Liskov Substitution Principle? apply to documents without the need to be rewritten? I moved it to my new system on which I installed VS only. To-do this, select your web-project in the solution explorer, right click and select property pages. Thank you @Serge and I will keep this on a permalink. Find centralized, trusted content and collaborate around the technologies you use most. With VS2013 on Win 7 all I had to do was re-start Visual Studio, no need to reboot. Why are UK Prime Ministers educated at Oxford, not Cambridge? However, this command requires elevated privileges so you have to run the command prompt as administrator. Position where neither player can force an *exact* outcome. Sometimes you need to change the port directly in applicationhost.config file. Is there an industry-specific reason that many characters in martial arts anime announce the name of their attacks? What's the proper way to extend wiring into a replacement panelboard? If you ever change it back to "In Process" for testing and it doesn't work, you'll have to delete the .vs folder again after you change it back and close the project. We solved this problem with deleting .vs folder on project folder and deleting temporary ASP.NET files. Thanks :*. 504), Mobile app infrastructure being decommissioned. VS creates a new port for each app when it is created in the solution to ensure you do not have port conflicts. Position where neither player can force an *exact* outcome. I can't believed that worked, but I'm not complaining. Microsoft Store. If you are just testing apps and want to reuse a registration then you must make sure that the app you are currently working on is the ONLY one on the port - manually. I had the same issue and fixed by doing that (by changing the port number). I was facing the issue multiple times in VS2019, then I realized when I make small edits and restart the IIS Express this problem is more pronounced. . Can FOSS software licenses (e.g. To learn more, see our tips on writing great answers. Please read this . NOTE: When I forget to run VS2013 as Administrator, my Local IIS project gets inserted in the IIS Express applicationhost.config file, which fails to open the web project. I ended up changing the application to run on a different port, it worked for me. On tab section, change the project URL for other port, like 8080 or 3000. The problem will be solved. Then if I attempt to connect again, it will give me the same error again. Reason: VS/IIS Express maintains bindings to all the ASP.NET Core projects in your solution that use IIS Express as the server. You can then connect to this site in a browser by simply saying http://localhost:8010/. That worked for me, without closing VS19 project. Because the reason is a port number conflict with some other application. C#, Visual Basic, and SQL Server Express work fine with the 2.0 framework . If you've used netsh http add urlacl url=http://localhost:/ user=everyone to add a specific url acl using the problem port then you'll need to delete it with netsh http delete urlacl url=http://localhost:/ user=everyone. Ideally you shouldn't have to run Visual Studio as an administrator or with administrative rights. You are probably getting access denied because the port is reserved possibly as an url acl: For me it all started when I ran application without debugging option (Ctrl + F5). It could also just be that there are iisexpress.exe processes hanging around in task manager which were running on the same port. It may be blocking. There's far from enough information to help you with your problem here. Can you say that you reject the null at the 95% level? Click the Add button to add a new external tool menu item. To begin, choose the option Connect to a Server like below. How do planetarium apps and software calculate positions? If you use a newer version of Visual Studio, you may not have this problem. 503), Fighting to balance identity and anonymity on the web(3) (Ep. A little bit of a "just get it working" fix without much investigation, but deleting the folder IIS Express is located under. I only had to close the browser "Chrome" then made sure that the port is not in use in my Network Activities using some utility then tried again and worked without any problem. I solved this just now, in the system tray (bottom right) you can click ion the IIS icon and stop the current site, then it allowed me to run. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Not sure what caused the issue for my VS2013 - but I am constantly flipping between VS2013 sites in IIS and IIS Express. Additionally to Bruno's answer I ended up registering the same port for localhost. I ran the web app from the command line using the dotnet run command to see if that would bring up any meaningful errors, and there was a warning about the URL not being correctly bound. Check out whether this file exists in your framework folder to verify whether it was accidentally deleted. How do you count the lines of code in a Visual Studio solution? Alternatively, you can allow any user to do remote debugging. The solution here is to manually adjust the host file to your likings in \app(N).vs\app\config\applicationhost.config to align with whatever port you set in Properties>Web>Project URL. Select the Use Output Window checkbox (this will prevent the command-shell window from popping up. Restarting VS 2017 and deleting the hidden folder .vs in the root folder solved this for me. unable to connect to the configured development web server [closed], Going from engineer to entrepreneur takes more than just good code (Ep. Restart VS and rebuild solution. This answer is the only one that seems to work. Why are there contradicting price diagrams for the same ETF? Otherwise, you're question's going to get closed. ASP.NET Web Site or ASP.NET Web Application? There are many resons why this can happen. Visual Studio debugging/loading very slow, "Unable to launch the IIS Express Web server." It's difficult to tell what is being asked here. Could an object enter or leave vicinity of the earth without being detected? Making statements based on opinion; back them up with references or personal experience. Did Great Valley Products demonstrate full motion video on an Amiga streaming from a SCSI hard disk in 1990? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. But if i change it back to VS Web Server it still have the problem. Click Exit there and run your project should work. Never look back. But often the reason is that Hyper-V has reserved one or more of the ports. At least not in the world of software. Then if I attempt to connect again, it will give me the same error again. This thread mentioning the error lead me to a thread that mentioned a missing iss express development cert, which mentions solving it by running ./IisExpressAdminCmd.exe setupsslUrl -url:https://localhost:{port}/ -UseSelfSigned in the IIS Express program files directory in an admin powershell terminal. Add a comment. if this is the issue just add the exception as above mentioned. Is it possible for SQL Server to grant more memory to a query than is available to the instance. I was having the issue on Visual Studio 2019 with a clean branch from master. adding exclusion to file devenv.exe in windows defender (anti virus, Win10). Why should you not leave the inputs of unused gates floating with 74LS series logic? Not the answer you're looking for? For example if you use Kestrel or some other server you will not have this problem. No symbols have been loaded for this document in a Silverlight application, How to connect to my http://localhost web server from Android Emulator, Calling a web service gives "Unable to connect to remote server error", Visual Studio debugging/loading very slow. (clarification of a documentary). Close VS and delete the .vs folder, that is in the root of your solution. It seems like IISExpress has no error message in this a case. Does a creature's enters the battlefield ability trigger if the creature is exiled in response? Stack Overflow for Teams is moving to its own domain! are you ok now :)? Stack Overflow for Teams is moving to its own domain! Click Next to complete the Wizard. If I go into the project properties under debug and change the port, then it will connect 1 time. You must close the visual studio first. After realizing that there is just no way to change where Visual Studio is looking for IIS Express (even though it's also installed on the D drive), I uninstalled IIS Express (which is probably how my dev cert got removed), in RegEdit changed my Program Files directory back to the "C\Program Files" folder (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion > ProgramFilesDir key), and reinstalled IIS Express from Microsoft. how to know this is the issue; Setting SSL to false resolved the issue. When I run my web application from Visual Studio I get the following message: Please try after restarting your machine. In my case, my Documents\IIS Express was from an older system with Visual Studio + WebMatrix installed. Not the answer you're looking for? 1 Connect to Oracle DB from Visual Studio step by step 1.1 Connect to Oracle DB from Visual Studio Prerequisites 1.1.1 1) Download and install Oracle Client and Oracle Data Provider for .Net 1.1.2 2) Configure tnsnames.ora file for Visual Studio 1.1.3 3) Configure Oracle Data Source Connection in Visual Studio rev2022.11.7.43014. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. If you use a different version of Visual Studio; you may also change the port number by project's Properties Window in Solution Explorer. Stack Overflow for Teams is moving to its own domain! Why bad motor mounts cause the car to shake and vibrate at idle but not when you give it gas and increase the rpms? Why doesn't this unzip all my files in a given directory? Re-think your question and add some specific diagnostic information and you have a chance of receiving some assistance. 1- Go to 'Debug Properties', Find 'Web Server Settings', Change the port in 'App URL' section and save the changes In your project folder, delete .vs file, also remove the launch settings file in properties (make sure you copy to a different folder before removing it). Substituting black beans for ground beef in a meat pie. Select the start options setting on the left, and under server change the radio button value from the default (which is use built-in webserver) to instead be Use custom server. 503), Fighting to balance identity and anonymity on the web(3) (Ep. Why should you not leave the inputs of unused gates floating with 74LS series logic? Open Project then rebuild solution. Right click shortcut-->properties-->advanced-->check run as administrator. I deleted IISExpress folder from [Documents]/IISExpress Seems very strange. Changing the port number does not solve the problem for me. Windows XP I would call this a workaround, not a fix. Does English have an equivalent to the Aramaic idiom "ashes on my head"? I just encountered and resolved this in VS2013 on Windows 7. Visual Studio will generate a new config for this project. I realize there are many posts out there claiming to fix this but I have tried every method they suggest and none are working. Unable to connect to the configured development Web server. I installed core 2.0 and updated VS 2017 to 15.4.3 today, had the same error. Is there an industry-specific reason that many characters in martial arts anime announce the name of their attacks? warning? Connect and share knowledge within a single location that is structured and easy to search. it's not a specific piece of codethis happens when i try to press the start button and view the website on browser, It used to work properly until today's morning although i didn't change anything in the code. 504), Mobile app infrastructure being decommissioned, Visual Studio 2017/IIS Express: Unable to connect to the configured development Web server, Visual Studio "Unable to start debugging on the web server. Why doesn't this unzip all my files in a given directory? Restarting had no effect. 504), Mobile app infrastructure being decommissioned, Unable to connect the configured development Web server Visual Studio 2013, Visual Studio 2017/IIS Express: Unable to connect to the configured development Web server, How to solve "Microsoft Visual Studio (VS)" error "Unable to launch the IIS Express Web server", Unable to connect to the configured development web sever, unable to connect to the configured development web server in c# project, unable to connect to the configured development web server error while running any project. Is it enough to verify the hash to ensure file is virus free? Connect and share knowledge within a single location that is structured and easy to search. Thanks for contributing an answer to Stack Overflow! I click OK, and project never runs. Share Improve this answer Follow answered Oct 21, 2009 at 21:20 Carlos Muoz 17k 7 56 78 I don't understand the use of diodes in this diagram, Replace first 7 lines of one file with content of another file. I've just found a couple and killing them solved this problem for me without needing to delete any .vs folder or changing ports or anything like that. Close the Visual Studio and delete this folder. warning? What is the rationale of climate activists pouring soup on Van Gogh paintings of sunflowers? Did find rhyme with joined in the 18th century? (clarification of a documentary). This was not the first time it happened and the removal of the urlacl resolved my first instance, but not this time around. Microsoft Store. rev2022.11.7.43014. It will show up all running application, at last can find Exit. it will run, Running Visual Studio 2015 as Administrator working fine for me. Confirming that this fixed this for me in VS2019 on Windows 10. Well, I found some answer but it didn't solved the problem. But when I examined the Properties Window (F4), SSL was enabled. For the Command textbox setting enter this value: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\WebD ev.WebServer.EXE (note: this points to the web-server that VS usually automatically runs). MIT, Apache, GNU, etc.) At least I can keep on working now. How do I remedy "The breakpoint will not currently be hit. 503), Fighting to balance identity and anonymity on the web(3) (Ep. Anyone have any ideas or fixes they used? Make sure option From Visual Studio .vs folder is selected. Counting from the 21st century forward, what place on Earth will be last to experience a total solar eclipse? Obviously I don't know if this is the problem you had but definitely it is something similar, essentially the problem should be that the same port used by your Development Server is not available because it is already used by another web server. Is there an industry-specific reason that many characters in martial arts anime announce the name of their attacks? When you try to run your project from visual studio if you encounter this error, it is because the port number is already taken by another process. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Everything was Just Working(tm) and then, woke up the next day for workand it wasn't. People usually have no idea what are the settings, so they have no easy way to tell what's up. I got the issue when I have copied the solution from one machine to another one. You can now select any web project in your solution and then choose this menu option to launch a web-server that has a root site on port 8010 (or whatever other port you want) for the project. InProcess hosting uses a custom IIS Module that bootstraps a custom .NET Core host right into the IIS host process which provides better performance and a smaller footprint. MIT, Apache, GNU, etc.) You need to check your firewall. For help clarifying this question so that it can be reopened, Not the answer you're looking for? Was Gandalf on Middle-earth in the Second Age? Check this link which has some other possible reasons. Installed a couple weeks ago and was running fine but just had a few problems with server in last couple days, like connecting to the lan and some strange things with Visual Studio then. People should try this solution first if they stumble across such an issue. i created a new solution and imported the projects. The IISExpress showed the error Unable to connect to web server 'IIS Express' which was fixed after deleting the iplisten entry using: You can view the current list of iplisten entries using. Delete .vs folder on project folder that includes applicationhost.config file. I had this problem. Deleting .vs folder in the project folder helped me to fix this. The error just started appearing for no obvious reason, and I tried the solutions posted here. Dear Microsoft, why is it I have to perform one or more web searches on random Visual Studio failures nearly every single workday? Can you force Visual Studio to always run as an Administrator in Windows 8? There is a hidden folder in directory of project that name is '.vs'. Right-click the taskbar and select Task Manager. You must have unique port assignment in your solution. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. Close Visual Studio and re-start it with Administrative priviledges ( right-click > Run as Administrator ). Light bulb as limit, to what is current limited to? A friend suggested not using IISexpress which has circumvented the problem. Account profile; Download Center; Microsoft Store support; Returns; Order tracking Open "Command Line Interface (CLI)" called "Command shell" with Win + R write "cmd" Open CLI windows like administrator with mouse context menu on opened windows or icon "Run as administrator" And then, choose the targeted Visual Studio solution file (.sln) like below. Space - falling faster than light? Find centralized, trusted content and collaborate around the technologies you use most. Visual studio 2019 Unable to connect to web server 'IIS Express', Cannot Delete Files As sudo: Permission Denied. You can configure Visual Studio to always run as an Administrator by right-clicking the Visual Studio shortcut icon, choosing Properties > Advanced, and then choosing to always run as an Administrator. Visual Studio 2015, Windows 10, project source control was managed in TFS Online. This worked. Good point for create "Pre-requirements" - better for contribution like this is comments - you can still get point if it is valuable. This means that you are missing the right for using it. Position where neither player can force an *exact* outcome. Is SQL Server affected by OpenSSL 3.0 Vulnerabilities: CVE 2022-3786 and CVE 2022-3602, A planet you can take off from, but never land back, Position where neither player can force an *exact* outcome, I need to test multiple lights that turn on individually using a single switch. MIT, Apache, GNU, etc.) I can then switch the port back to the original and it will load one time, then it will fail any time beyond that, until I switch it again. Expand; Introduction Today I encountered the issue "Unable to launch the IIS Express Web Server" while I was running my Visual Studio 2012. SOLUTION This means that you are missing the right for using it. Visual Studio; Visual Studio Integrate; VSIP Program . If you're hard-coding a specific IP address (not localhost), check that it hasn't changed. I gave up, and chose to run the project as self hosted, instead of 'IIS Express' in the play/run drop-down box. How to solve Microsoft Visual Studio (VS) error Unable to connect to the configured development Web server, It seems that once higher version of VS installed at the system and after that working on vs lower version ,Just Delete the IIS express folder created in /documants Making statements based on opinion; back them up with references or personal experience. But if i change it back to VS Web Server it still have the problem. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Unable to launch the IIS Express Web server, "Unable to launch the IIS Express Web server" error, Unable to launch the IIS Express Web server, Failed to register URL, Access is denied. For me it was the IIS Express configuration. Thanks for contributing an answer to Stack Overflow! Restart visual studio and your machine if possible. Can FOSS software licenses (e.g. Since when you need to be administrator to debug with Visual Studio??? that would be helpful add give you up votes. All root based references will work fine. Select the "Tools->External Tools" menu option in VS or Visual Web Developer. Visual Web Developer works until I try to run or debug. Stack Overflow for Teams is moving to its own domain! Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. At least I can keep on working now. I looked in my projects Properties\launchSettings.json file and noticed that the applicationUrl properties were different. rev2022.11.7.43014. that's good, but I don't know this, can you update my answer with this url, I tried the 6 steps.they dont work..Still the message appears. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Another solution is to run Visual Studio as an administrator which allows it to override the urlacl. I have deleted the .vs folder started Visual Studio as administrator and changed the port number. Running on windows server 2000. It works after I reenter username and password for the application pool's identity account. Did Great Valley Products demonstrate full motion video on an Amiga streaming from a SCSI hard disk in 1990? When the Littlewood-Richardson rule gives only irreducibles? It creates options for malicious code. Not the answer you're looking for? How do I add an existing directory tree to a project in Visual Studio? How do you auto format code in Visual Studio? All ok after change the port on project settings. I encountered this issue. Anyway thanks for all the suggestions above. How do I restore a missing IIS Express SSL Certificate? From the Solution explorer in Visual Studio, right-click on the solution name for properties, and then click on Open Folder in File Explorer: that's where you'll find the folder to delete. For more details check https://www.c-sharpcorner.com/blogs/iis-express-failed-to-register-url-access-is-denied. Try this: Step 1-> go to Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\Remote Debugger\x64 and run msvsmon.exe as administrator.Then you will get a window stating Msvsmon started a new server named *****. So it might be that anything that writes to that preferences resolves the problem, rather than the details of what was written. I've finally solved the problem, it seems that I was missing the right of using the server (or something like that) Any way you can find the solution in this link How to solve "Microsoft Visual Studio (VS)" error "Unable to connect to the configured development Web server" Share Follow edited May 23, 2017 at 12:15 Community Bot 1 1 Restarting the PC solved the problem. @Muhammad Akhtar, your link does not show result when i click it. How to solve "Unable to connect to the configured development web server on" in vs2015? I am using visual studio 2015. Why are UK Prime Ministers educated at Oxford, not Cambridge? I had solved this here : Changing project port number in Visual Studio 2013. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Delete .vs\config\applicationhost.config file, then right click on prject solution -> properties -> debug tab ->web server settings, change port number to be different from all other applications. warning? Detailed exception : Unable to connect to the remote server-----> at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context) at System . If the answer is the right solution, please click "Accept Answer" and kindly upvote it. I press the green start button (used to debug the application). Click End Task for any instances of WAMP that are still running. Did the words "come" and "home" historically rhyme? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Unable to connect to the configured development web sever, How to solve Microsoft Visual Studio (VS) error Unable to connect to the configured development Web server, Going from engineer to entrepreneur takes more than just good code (Ep. Dec 03, 2021 at 04:09 AM. . Concealing One's Identity from the Public When Purchasing a Home. It is a Web Application Project that doesn't use SSL. How do you auto format code in Visual Studio? Deleting the entire old project (specifically the .VS) and then remapping it fixed everything. May be it's because I have binding for localhost in aplicationhost.config also. How does DNS work when it comes to addresses after slash? Anything else you , or anyone reading this can offer will be much appreciated. The issue didn't occur again for me. Is it possible to make a high-side PNP switch circuit active-low with less than 3 BJTs? This solved the issue I was having. When you select No Authentication, you can then check Allow any user to debug. No symbols have been loaded for this document in a Silverlight application, Visual Studio 2015 or 2017 does not discover unit tests, Unable to Install Any Package in Visual Studio 2015, ASP.NET 5 MVC: unable to connect to web server 'IIS Express', How to use visual studio development server in VS2015, Could not load file or assembly "System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", Unable to launch the configured Visual Studio development web server. Finally I was forced to uninstall IIS Express, re-start the machine, and install the same version again from Microsoft. :-), maybe after 6 years they have fixed it :-). Thanks for contributing an answer to Stack Overflow! Where to find hikes accessible in November and reachable by public transport from Denver? I have solved this issue by The web server is not configured correctly See Error: The web server is not configured correctly. After playing with netsh configuration trying to make the server accessible from outside, I added a new iplisten entry. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Will it have a bad influence on getting a student visa? Just update Visual Studio, this is the simplest solution that worked for me. For me I tried a few of the above - run as administrator, check firewall. Finally, I can run my .Net Core API locally using IIS Express. If you start using "Microsoft Internet Information Services Express (IIS)" from "Microsoft Visual Studio (VS)" you may get when you run Build this error message. This will allow you to configure and add new menu items to your Tools menu. The diagnosis of @Turneye may very well be the reason and his solution might accomplish the same result. Can FOSS software licenses (e.g. Try running Visual Studio as Administrator. How do I add an existing directory tree to a project in Visual Studio? When the Littlewood-Richardson rule gives only irreducibles? Great answer (+1), but why does this happen in the first place. p.s I've checked the answers of similar questions and it didn't help. Something else can be running on your port that interferes.

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