Unable to connect to web server iis express 尝试以管理员身份运行VS，然后再调试运行 2. 2 solution and try to debug it, and bump, I get the “Unable to connect to web server ‘IIS Express’” I don’t have any url reserved running “netsh http show urlacl” in powershell. Make sure that the “Use the 64 bit version of IIS Express for web sites and projects” option is checked if you are using the 64-bit version of IISExpress. config Go to the properties of the project, navigate to the Web Tab, In the Use Local IIS Web Express option. It mostly seems to affect IIS Express. I restarted the system . But still it showing "Unable to connect webserver 'IIS Express'" Apr 6, 2022 · Delete . Nothing is running on the Sep 8, 2013 · 50 There may be many reasons for the above problem. NET Core Web Application template, I try to run the default code without any changes, but I continually get and error message saying, "unable to connect to web server IIS Express". 2. We have multiple other servers in the environment running the same configuration, OS version, patches etc. NET Framework and . Server and changed port on App URL. This is happening to multiple projects in a solution but when I create a new project in a fresh solution, I can run new projects fine. net or asp. However, sometimes you may experience problems connecting to IIS Express. Bookmark the permalink. (Open Properties > Web > Servers or Properties > Debug depending on your project type. 删除解决方案目录中的. vs文件夹 问题分析： 如果用第一种方法能解决一般启动地址设置的是IP或者域名，当启动地址中主机名用的是IP或者域名时必须 Oct 24, 2013 · I tried this but anytime I try editing the applicationhost. In Solution Explorer, "Properties", "Startup Options" only allows me to enable "Use default web server". Net Web Form application and an ASP. vs\config\applicationhost. work Jun 26, 2019 · Then I open a net core 2. After removing the erroneous entries and killing IISExpress process I was able to work fine. NET Core 一半忽然發生整個應用程式 hang 住不動，接著 Visual Studio 自動關閉重新啟動，啟動後心想沒事就開始繼續 Alt+F5 繼續偵錯，過沒多久就跳出提示視窗顯示訊息 "Unable to connect to web Jun 5, 2025 · Delete . net framework 4. Net core 2. Jul 14, 2016 · Unable to connect to web server 'IIS Express' when domain name specified #1671 May 23, 2019 · Cannot start IIS Express: 0x80070020 Closed - Not Enough Info 0 15 Although the solution opens. Jun 25, 2020 · Unable to connect to web server IIS Express - ASP. So under Properties / Debug, I checked the "Enable SSL" checkbox. Aug 7, 2021 · Usually, a restart will fix it, but you can also try to delete the bin, obj, and . This image is from visual studio 2015 Jun 18, 2024 · How to Fix ERR_SSL_PROTOCOL_ERROR in IIS Express for Visual Studio Projects Running into the “ERR_SSL_PROTOCOL_ERROR” while using IIS Express with Visual Studio can be frustrating. And every time I change a port in the appsettings. how to fix this error? right click on project , create virtual directory Oct 30, 2017 · Visual Studio : Unable to connect to web server IIS Express This is with VS 2017. 1 shows the error: We were unable to get this feedback item. I've sometimes ended up with creating a new project and copied all files over and that always works. 网上搜索了一下发现 在依乐祝 Oct 13, 2021 · I have "Internet Information Services" and "Internet Information Services Hostable Web Core" enabled in my features tab I'm running the latest version of Windows 10, completely up-to-date Aug 9, 2024 · Visual Studio 2022 - IIS 10 - Unable to start debugging on the web server - Timeout Asked 1 year, 3 months ago Modified 1 year, 2 months ago Viewed 912 times Jan 21, 2025 · Hi team, I have a problem with IIS Express after updating to Windows 24H2, starting a web application in Visual Studio with . exe; which is for creating users tables in an SQL Server database - cargo-cult programming anyone?) Unable to connect to web server (no answers) Unable to start debugging on the web server. net core application and run it in IIS Express directly. Feb 27, 2024 · When I try to run it using Visual Studio 2017, I get following error: Unable to launch the IIS Express Web server. So what are the expected settings? Jun 30, 2020 · "Unable to connect to web server 'IIS Express'" Creo que llevo años encontrándome de vez en cuando con este problema al arrancar las aplicaciones, y nunca entendí muy bien por qué pasaba. This changes the port so I then did a copy / replace of the old port to the new one and changed the URL to https e. In the Properties window, click the Web tab. /Edit: They are two different projects, have nothing to do with each other, but both have problems with IIS Express. I don't know how to connect my project to IIS instead of IIS express. 1 Web App, error 'Unable to connect to web server 'IIS Express' Asked 5 years, 4 months ago Modified 5 years, 4 months ago Viewed 3k times Delete . I realize there are many posts out there claiming to fix this but I have tried every method they suggest and none are working. I get hit with the following error: "Unable to connect to the configured development web server Output from IIS… Apr 23, 2019 · Web Site Administration Tool: Unable to connect to SQL Server database (using SQL Server Development Edition) (aspnet_regsql. NET Core 3. "/". Output from IIS Express: Failed to register URL "http://localhost:4667/" for site "Working" application "/". Oct 14, 2018 · Unable to connect to web server IIS Express murphymj5209 October 14, 2018, 1:23pm 1 Mar 28, 2025 · The IIS Express folder is generally located inside the program files (x86) folder even in windows 11. When I try to start the application with IIS Express, I… Oct 14, 2024 · I am trying to run a project via Visual Studio 2022 that uses IIS Express, but am unable to get past building the project. /Edit VS Studio 2022 is updated, no firewall or virus scanner is… May 16, 2017 · "Unable to connect to web server 'IIS Express'" Asked 8 years, 6 months ago Modified 4 years, 8 months ago Viewed 16k times Unable to connect to IIS Express? Here's how to fix it IIS Express is a powerful development tool that allows you to create and test web applications on your local machine. Net Api. Aug 29, 2024 · 2. Encountering issues launching the IIS Express web server on your local machine? Don't worry, we've got you covered! In this video, we'll walk you through the When it says it was “Unable to connect to web server ‘IIS Express’”, we know the IIS Express settings must be broken. " Deleting applicationhost. Apr 6, 2022 · Something I think you can try and if anything wrong or abnormal, I need your feedback. net. You can change the App URL back again afterwards, Read more > Unable to connect to web server IIS express, Visual studio Feb 14, 2023 · Le message d'erreur " Unable to connect to web server 'IIS Express' " apparait (ne pas cliquer) Cliquez droit sur l'icône IIS Express dans la barre des tâches en bas à droite de votre écran (à côté de l'horloge) et vérifier que votre site est bien afficher dans la liste. 3. config 3. Attendez éventuellement quelques secondes qu'il y apparaisse. Try the pop-up icon method first tough as it's cleaner and safer. Jan 23, 2023 · Your changes to IIS Express/VS/project settings are not in sync, so IIS Express cannot be launched. May 16, 2021 · This entry was posted in . Feb 3, 2020 · thefrozencoder - Programming and Technology blog - Unable to connect to web server IIS Express 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. work Aug 20, 2012 · For older versions of Windows (Server 2003, XP, etc. This would be used if you were running IIS (not IIS Express) on your local machine and wanted Visual Studio to debug the app running on IIS. "unable to connect to web server iis express" hatasının çözümü. more It would be nice if Microsoft did some integration testing of Visual Studio / IIS Express along side with HyperV and the "normal" IIS Service OR gave some guidance on which port ranges to use for VS / IIS Express (and which ports to avoid). Delete your web application's . NET 5 MVC: unable to connect to web server 'IIS Express' To Access My Live Chat Page, On Google, Search for "hows tech developer connect" I promised to share a hidden feature with you Jun 19, 2020 · ASP. And now it runs. config file for my solution, I get a "Unable to connect to web server: IIS Express". 1. This includes projects targeting . Jun 29, 2023 · when i try to run my vs2022 project it show error cannot reach this page due to not start IIS Express, after that i am try to start it with trace:error to show the following: C:\Program Files\IIS Express>iisexpress. Dec 11, 2019 · Now I get a message: "Unable to connect to the configured development Web Server. Mar 21, 2023 · I copied a Visual Studio 2022 ASP. 4 I cannot start my web project due to error “Unable to connect to web server IIS Express”. The issue may surface and we may receive different errors. If any, update. In this case IIS Express is trying to start the second web app but is unable to secure the configured port because the first web app as already been hosted using it. Nov 5, 2019 · 在运行微软示例工程eShopOnWeb时候, 在经过一段时间再运行启动报Error "Unable to connect to web server 'IIS Express'" (无法连接到Web服务器“IIS Express”). So I thought of sharing how to resolve that issue. It is ASP. Feb 9, 2023 · You should try to change Port in Project Url for IIS Express in {Project File}->Properties -> Right click to Project File ( example with ShopMobile here) then choose Properties At Project Url in Web tab , try to change Port to another Port ( can increase by 1 )then click "Create Virtual Direction" then Ctrl + S. UNABLE TO LAUNCH IIS EXPRESS WEB SERVER" ON VISUAL STUDIO 2019(Recorded with https://screencast-o-matic. Try below mentioned ways to fix this: 1) Restart computer 2) Restart Default Application Pool from IIS Manager 3) Check for any updates of visual studio. vs\applicationhost. Net, Cloud, Community, Computers and Internet and tagged Unable to connect to web server IIS Express. 1K subscribers Subscribe Mar 7, 2024 · Right-clicking the icon of the IIS Express server in the task menu of Windows 11, I see the ports he is listening on. /Edit VS Studio 2022 is updated, no firewall or virus scanner is… Mar 25, 2016 · How to solve "Unable to connect to the configured development web server on" in vs2015? p. Also, When I try to run it from debug menu, I get following error: Unable to launch the IIS Express Web server. You need to check this:- Unable to Start Debugging on the Web Server On a side note:- Go to IIS and check that the App Pool you are using is started. There Jun 8, 2019 · I have a web application that can no longer launch in IIS express since upgrading from VS 2019 16. Hi, I am using Visual Studio 2017. 1 shows the error: Oct 10, 2021 · And press f5 for the popup error ” unable to connect to web server ‘IIS Express’. Jan 27, 2025 · I am facing issue with IIS Express after updating to Windows 24H2, starting a web application in Visual Studio with . Restarting the HNS service may release the reserved port. Feb 3, 2020 · thefrozencoder - Programming and Technology blog - Unable to connect to web server IIS Express "environmentVariables": { "ASPNETCORE_ENVIRONMENT": "Development" } } } } It works well in my system. com and stakcoverflow where developers are unable to start or load their website in IISExpress all of a sudden and this remain unanswered. Below are some of such errors 1. Set launch profile to IIS Express. I was looking at a . config and try again. I was working on a web application, and suddenly the application stopped running on the browser and I got this error message, “Unable to connect to the configured development Web server. You can change the App URL back again afterwards, this just ensures VS will regenerate your applicationhost. How can this Unable to connect to web server 'IIS Express' I am able to resolve this issue after going through the following list: Delete applicationhost. Installed IIS yesterday, and while it works I don't know how to use it in my project. NET MVC project that I was working on from my desktop machine to my laptop. Delete your web application’s . As an administrator account restart the hns service. Restart VS and rebuild solution. config or through project properties does nothing. NET CORE Asked 5 years, 2 months ago Modified 5 years, 2 months ago Viewed 1k times Aug 1, 2020 · Fixing IIS Express error: Failed to register URL for site. Jan 13, 2017 · A series of workaround that might help fixing the 'Unable to launch the IIS Express Web server' error when debugging a Web Application on Visual Studio 2015. 7. Try this from your command line:- 🚨 Visual Studio “Unable to connect to web server 'IIS Express'” Issue? Here’s What Helped Me! 🧩 Recently, I encountered a frustrating issue where my ASP. Net application from Visual Studio Visual studio will prompt for generating a certificate, click yes. Note that this will kill IIS Express completely, meaning that all web sites will stop, so you'll have to restart each one in VS if you want to debug any others. NET Core Web API - Unable to connect to web server 'IIS Express' May 7, 2014 · Open Windows Task Manager and kill the Microsoft. 2. com) May 18, 2023 · I use Windows 11, VS 2022 and Asp. I would like to be able to debug using IIS or IIS express. Ihen I download my project from TFS in another remote system and changed the ipaddress to support remote ip hosting and run the application in adminstrator mode. 5) Change localhost port number from Application Properties Mar 15, 2023 · This video shows you how to fix this error in Visual Studio 2022: Unable to launch the IIS Express Web server. The start URL specified is not valid. Leave a comment for cont Mar 11, 2024 · If you are debugging locally in Visual Studio, verify that the correct server is selected in the properties. Sep 14, 2021 · ASP. ), you can download IIS Manager and run the appropriate bit-version of the installer to install it. Host. So that changing the port number of your project Apr 14, 2021 · Previously IIS Express was opening new browser window with URL of the application, and I was able to debugging my code. NET version you use? Something I think you can try and if anything wrong or abnormal, I need your feedback. 0 to 16. There are many resons why this can happen. NET Core project (2. Sep 2, 2023 · 🔒 **Unable to launch the IIS Express Web server, Failed to register URL, Access is denied** 🔒 Hey there, fellow developer! 👋 Are you facing trouble launchin Sep 5, 2019 · Moreover, after this error came up, I could actually see the site running locally and I got the icon for IIS Express in my taskbar but Visual Studio still refused to start debugging. Hope this works for you as well. ” Deleting applicationhost. When I attempted to test/run the app in debug mode from within Visual Studio 2022, I got an "Unable to launch the IIS Express Web… Nov 7, 2024 · I'm developing an ASP. May 12, 2020 · unable to connect to web server iis express in vs 2019. This article will show you how to troubleshoot and fix common connection problems. Changing the port in applicationhost. Sep 27, 2023 · Regarding "Unable to connect to web server" you need to show more details (screen shots, or video clips). Check Visual Studio Configuration: In Visual Studio 2022, go to Tools > Options > Projects and Solutions > Web Project. Jan 13, 2021 · When you get the error “Unable to connect to web server ‘IIS Express’ you probably try to start the website with a port that is in an excluded port range Oct 8, 2021 · These steps solved this issue: Delete the applicationhost. I mean it doesn't make any sense, any ports I tried I get the same "unable to connect to web server iis express error. Jan 29, 2012 · I have created an ASP. 8. Today I encountered the issue "Unable to launch the IIS Express Web Server" while I was running my Visual Studio 2012. vs folders from the project, then shut down the iis express service and try to run it again. You can check your web server’s configuration to make sure that it is properly configured to resolve hostnames. 2) targeting full . but do not see this issue. NET 8. Feb 28, 2016 · And press f5 for the popup error "unable to connect to web server 'IIS Express'. Enjoy! Here's some things you can do to try and fix the error message 'Unable to Connect' when you're testing your web application in Visual Studio. config file and letting vs create another but then I lose my bindings. Feb 15, 2019 · Recently I have come across several issues and have seen variosu queries in connect. Unable To Connect To web Server iis Express | Visual Studio IIS Problem Fixed Code with Salman 14. The issue is consistent across multiple Visual Studio versions and project types. Nov 2, 2013 · The request hostname is invalid” when trying to browse an IIS Express site using a different host name or IP address. https://localhost:44300/ and I cannot debug the code. Delete . Dec 7, 2020 · Unable to connect to web server 'IIS Express' Closed - Duplicate View resolution 1 3 0 Votes mi mirirui. Feb 6, 2013 · Since I am unable to add a comment to @Garret Fogerlie's post and in response to the commenters' issue (@Y. exe /trace:error Starting IIS… Apr 9, 2021 · In this case the range 64808 - 64909 is the cause and IIS Express will not be able to use it. For a Web Forms project, open Property Pages > Start Nov 22, 2019 · Switched from IIS to BlazorBoilerplate. I have seen that the directory "C:\Program Files\IIS Express" exists. com Aug 6, 2025 · Starting Monday, August 4, 2025, all web applications fail to run in Visual Studio using IIS Express. The only thing I see is the Connection was reset in the web browser (both Chrome and latest version of Edge) (sorry the image file won’t load properly) It is to localhost (for testing purposes). Unable to connect to web server 'IIS Express' SharpCoder 614 subscribers Subscribed Apr 6, 2022 · Delete . Learn the common causes and solutions for the error "unable to connect to IIS Express" in Visual Studio 2022. Mar 20, 2022 · VS2022 调试运行出现“无法连接到Web服务器“IIS Express””弹窗，如下图： 解决办法： 1. Ecarri and @SamuelEdwinWard), I followed what Garret suggested, using Visual Studio 2013, running it in Admin mode and changing the application. config in the <project_folder>. It could be because you don't have access to it or it doesn't exist Apr 6, 2022 · Delete . Solve the `Unable to connect to web server 'IIS Express'` issue in Visual Studio 2019 efficiently with this step-by-step guide tailored for ASP. Release the reserved port by restarting the Host Networking Service (HNS) The Host Networking Service (HNS) attaches container endpoints to a network. NET MVC 3 project, and am using IIS Express as the web server when developing. config. Try to create an empty asp. The msgs are the same, just the port number changes. NET MVC project wouldn’t Apr 6, 2022 · Hi @Coreysan , What kind of application and what . Understanding that IIS will listen on one port, and reverse proxy to another port where the Kestrel server is listening. Error description: The process cannot access the file because it is being. NET Core deve Sep 27, 2023 · The solutions I tried are: dotnet dev-certs https --clean dotnet dev-certs https --trust Uninstall IIS Express via Add Remove Program Run command: dotnet dev-certs https --clean Re-install IIS Express by downloading it from the Microsoft website Run the Asp. Jun 7, 2019 · So VS was launching IIS Express as admin, while the VS instance itself was not causing a connection issue. config, located in Documents\IISExpress\config, doesn't change the error message. The way is distinct the site is by the host header name. I also can't understand why this problem is not appearing for brand new project - I've created new web app project to test this behaviour, and it does what I expect - I can use debugging in VS. net core app I get this message. g. Open any web application in Visual Studio. Don't waste your time here if you really want to test things like HSTS. The process cannot access the file because it is being used by another process. ️Important: Microsoft are Moving your Files into the Cloud without you knowing - ACT NOW! ️ SOLVED: Unable to Connect when using IIS Express in Visual Studio Solution video of "unable to connect to web server iis express" error. NET Core/. Mar 20, 2019 · 問題 今天開發 . Oct 21, 2018 · If two projects are configured to IIS Express on the same port you will see a different error: Starting the web server is taking longer than expected. Nov 18, 2020 · After upgrading to VS 2019 16. Unable To Connect To Web Server Iis Express Unable to Connect to Web Server IIS Express: Troubleshooting Guide Introduction: IIS Express (Internet Information Services Express) is a lightweight, self-contained version of IIS, specifically designed for developers to facilitate the development and testing of web applications. Unable to connect to web server 'IIS Express' Closed - Duplicate View resolution 1 3 0 Votes mi mirirui. So you need to setup that on your web site. Visual Studio freezes for about 30 seconds before giving the error "Unable to launch the IIS Express Web server". config file, then right click on prject solution -> properties -> debug tab ->web Oct 23, 2022 · Unable to connect to web server ‘IIS Express’ If you get an error message that says Unable to connect to web server ‘IIS Express’, close Visual Studio and then open it by using the Run as administrator option from the right-click or context menu. Ran into this again today trying to run an old ASP website using the IIS Express button in Visual Studio. 6. config file, then right click on prject solution -> properties -> debug tab ->web server settings, change port number to be different from all other applications. config, located in Documents\IISExpress\config, doesn’t change the error message. Nov 2, 2017 · Visual studio 2017 "Unable to connect to web server 'IIS Express'" Asked 8 years ago Modified 2 years, 9 months ago Viewed 71k times Oct 10, 2013 · PROBLEM 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 Unable to connect to the Apr 21, 2021 · As a Visual Studio developer, you might probably very often get following error: Unable to connect to web server 'IIS Express'. Feb 24, 2014 · Port '53234' is already being used by process 'IIS Express' (process ID '5524') I have tried changing the port in project properties in Web tab, but it does not change anything. s I've checked the answers of similar questions and it didn't help. Already tried changing the ports, I reinstalled IIS, restarting Visual Studio and PC. For a Web Forms project, open Property Pages > Start Options > Server). In my case, it generated the Jun 5, 2025 · I faced this issue in Visual Studio, and here's what worked for me: The issue seemed to be caused by a caching problem in Visual Studio or IIS Express. Please tell me the result. Web. May 3, 2012 · I had a Visual Studio web project that was configured to use IIS Express on port 8080. more Aug 28, 2020 · Sometimes it says just Unable to connect to web server ‘IIS Express’. Open IIS Express’s applicationhost. The IIS is a multi web site server. I’m able to workaround this issue by running it with kestrel, but I’d rather use IIS Express. If I attempt to launch my . Make sure to give the correct URL and click on Create Virtual Directory Now Run the application, voila it worked for me!. This guide includes step-by-step instructions and screenshots, making it easy for even beginners to follow. 4) Delete obj and bin folder from web application. Then, in your project settings, change the App URL port to something new: Jun 7, 2018 · What I want to accomplish is to be able to open the web application I'm running in Visual Studio from my Android phone, so I added new binding in the file applicationhost. NET Core project and wanted to change from http to https. Instead, hosting your web app on local IIS, and use VS IIS integration to debug it, because IIS can hook to port 443 freely. NET Framework 4. I created a sample web application with . 8 from 16. microsoft. Find out how to check and configure the IIS Express service, port, and website settings. Mar 28, 2024 · Are you running Visual Studio and the Web server on the same machine and debugging using F5 (instead of Attach to Process)? Open your project properties and make sure that the project is configured to connect to the correct Web server and launch URL. config with my machine's I 58 I receive this error when trying to launch IIS Express from Visual Studio with a project that's configured to listen to an address other than localhost. Launch your app. Fix Step 1. Dec 24, 2024 · We have a server that suddenly started returning an HTTP 400 for Invalid Hostname after a reboot today. config Delete the entire /Documents/IISExpress folder Reinstall VIsual Studio Reinstall IIS After some combination of these (that seems to vary from day to day), the project builds and all is well. Jul 31, 2022 · Unable to connect to web server 'IIS Express' Closed - Not Enough Info View resolution 1 4 Nov 30, 2020 · Unable to connect to web server 'IIS Express' Closed - Not Enough Info View resolution 1 3. That should normally be fine and IIS Express is supposed to be able to run without administrator privileges, but when I would try to run the app I would get this error: Unable to launch the IIS Express… Mar 27, 2023 · unable to connect to server "IIS Express" or "https" while add area in my project Asked 2 years, 3 months ago Modified 2 years, 3 months ago Viewed 307 times Aug 28, 2015 · Solved - IIS Express failed to register URL - Access is denied Aug 28, 2015 Posted in: Visual Studio 2015, IIS Express My saga about broken stuff after Windows 10 upgrade continues (it all started with Virtualbox). Inside the IIS Express folder, we have many utilities such as the IisExpressAdminCmd that accepts a param called " setupsslUrl ", which further requires an url param and a cert param. 6 days ago · The "Unable to connect to web server 'IIS Express'" error appears when Visual Studio attempts to start your ASP. VisualStudio. exe*32 process, then you can run the project fine. Dec 1, 2021 · Using the latest version of Visual Studio 2019 and opening the ASP . Unable to launch the IIS Express Web server. Everything started working as expected — no more IIS Express errors. I'm having difficulty because google has old information. Aug 10, 2016 · When a project's Web settings are set to an external server, Visual Studio will try to connect to that server to debug the project. NET 5 MVC project but fails to establish a connection with IIS Express. The only thing that fixes it is deleting the . 8 or 4. See full list on softwaremeadows. json it ADDS another port instead of replacing it! Strangely enough, even though the error is related to the IIS Express Web server (and not IIS), installing an extra IIS component, it obviously alters something in the system. config file. This IIS server… If your web server is not configured to resolve the hostname, it will not be able to connect to the website. Oct 29, 2025 · The winnat service (Windows NAT Driver) handles Network Address Translation, often used by Hyper-V or Docker Desktop. I have installed iis from "Control Panel", "Programs and Features". Here is the steps that you need to follow: How to configure multiple IIS websites to access using host headers? In general, open your web site properties, locate the Ip Address and near its there is the advanced, "multiple identities for this web site". config located at the following path C:\Users\ <user> \Documents\IISExpress\config\applicationhost. Nov 7, 2024 · I'm developing an ASP. For me this is quite funny, but I cannot fix it. 0. If you are using an external (custom) server such as IIS, the URL must be correct. In this blog post, I decide to document one of the root cause for this issue I encountered and the fix, so I don’t have to spend more than a few minutes whenever I encounter this issue again. Today’s heroes are Visual Studio 2015 and IIS Express 10 (which comes with VS 2015 and replaces the old version if you had one C# : ASP. Exit the IIS Express instant currently running. In some cases, after a system update or an abrupt interruption of a project, this service may retain control over a network port, preventing Visual Studio from starting the web server (Kestrel or IIS Express). After the restart, I was able to run the project without any issues. Done! Run the application again to see if it work. The MailKit exception, however, is caused by the certificate used on the IMAP/SMTP server you configured, not the server certificate used by IIS Express or Kestrel. Learn how to troubleshoot and fix the unable to connect to Web Server IIS Express error in 3 easy steps. Jul 17, 2022 · In Solution Explorer, right-click the name of the Web application project for which you want to specify a Web server, and then click Properties. Then, in your project settings, change the App URL port to something new: Launch your app. When I try to debug, I get the error message below. how to get rid of these errors and debug/run the web site from VS 2012? Mar 30, 2018 · Also you can use netstat to see all the ports in use; be aware that you must look at all IIS Express ports you use, and all local IIS ports. miq zwzhwv scba ekcpsle gxrcx dnslq ibt tdb adgf vgvhvmh iqg zhlq hwhdqyw adhcx kfufi