ASP NET MVC5 IIS Express unable to debug - Code Not Running

Question

I start a VS2013 VB Net MVC5 Web Application  set a breakpoint in HomeController About method and run  Start Debugging   navigate to About page and receive the message  Code not running - The current Thread is not currently running or the call stack could not be obtained  preventing any debugging   If I set a breakpoint in Global asax Application Start  the breakpoint works fine  Changing the  Enable Edit  amp  Continue  makes no difference   Anyone have any ideas what is happening   Update  My environment was Windows 8 0 Pro with VS2013 Ultimate    I have since flushed my system and done a completely fresh install of Windows 8 1 Pro  VS2010 Ultimate  VS2012 Ultimate   amp  VS2013 Ultimate    Same test done on all 3 versions of VS - File   New Project   MVC  Default   All 3 versions of VS are reporting  Process with an Id of xxx is not running     VS2013 debug trace reports  The program   7720  iisexpress exe  Program Trace  has exited with code 0  0x0   The program   xxxx  iisexpress exe  has exited with code -1073741816  0xc0000008   An invalid handle was specified      I have run VS in and out of Administrator mode and receive the same results  I have uninstalled and reinstalled IIS Express 8 0

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The similar problem occurs in aspdotnet core with the same error The program   xxxx  iisexpress exe  has exited with code -1073741816  0xc0000008    Log file setup in web config did not produce any info also    lt aspNetCore  stdoutLogEnabled  true  stdoutLogFile    logs stdout    gt    To find exact error the next step with log info in command prompt helped    gt  dotnet restore  gt  dotnet run   In my case the problem was in dotnet core v 1 0 0 installed  while version 1 0 1 was required to be globally installed

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Go to project directory  vs config  and remove applicationhost config   Then restart project

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If you are using 64 bit machine  Go to Visual Studio   Tools Menu   Options

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I had a similar problem while moving from Visual Studio 2013 to Visual Studio 2015 on a MVC project   Deleting the whole  vs solution worked as a charm as Johan J v Rensburg pointed out

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The following steps fix the problem for VS 2015 and VS 2017     Close VS   Navigate to the folder of the solution and delete the hidden  vs folder   open VS   Hit F5 and IIS Express should load as normal  allowing you to debug

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Well   for me it was Telerik JustMock Q3 2013  13 3 1015 0  that caused the problem  Uninstalled it from VS 2013 and the problem has gone    see also ASP NET-MVC4 Code Not Running and http   feedback telerik com Project 105 Feedback Details 63749-unable-to-debug-asp-net-projects-with-q3-2013  One lost day and many new white hairs    Curse on you Telerik guys

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I made it work by doing the following    Delete the   vs  folder under the application folder Delete the  IISExpress  folder from the Document Enable the 64 bit version of IIS Express on visual studio by going to Tools -  Options -  Projects and Solutions -  Web Projects  May need to delete everything from temp folder May need to change the port by right click on project  go to properties  under web and change the project url port

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For me the solution was a much simpler one  In my Solution Explorer in Visual Studio  I right click on the web project  chose properties and then navigated to the  web  tab  From there I changed the Project URL to another port number  For example  if it was http   localhost 1052 - I changed it to http   localhost 4356     Not sure if this helps anyone else  but it worked for me - hopefully it will work for you too

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In my case the issue was that Virtual directory was not created    Right click on web project file and go to properties Navigate to Web Scroll down to Project Url Click Create Virtual Directory button to create virtual directory

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I had the same problem and my solution was the following   Instead of deleting the main applicationhost config  in your  Documents IIS Express  folder   check your solution folder for a hidden   vs  folder with a  config  sub-folder  If that folder exists and it has it s own applicationhost config file you need to either rename  or delete  that file or edit it and make sure the website s  configured inside match the ASP NET web app s  in your solution that you are trying to debug  Hope this helps

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Delete File C  Users congt Documents IISExpress

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I have solved this issue for me  Try to change all Deny values to Allow in file  SYSTEM DRIVE  Program Files IIS Express AppServer applicationhost xml  Please  take into account what IIS Express Web Server you are using in Visual Studio Settings  32 bit or 64 bit  that means I have to check the file in different folders  Then restart Visual Studio  I don t know about security issues for those config lines  so change them at your own risk  but it has solved my problem    lt section name  asp  overrideModeDefault  Allow    gt   lt section name  caching  overrideModeDefault  Allow    gt   lt section name  cgi  overrideModeDefault  Allow    gt   lt section name  defaultDocument  overrideModeDefault  Allow    gt   lt section name  directoryBrowse  overrideModeDefault  Allow    gt   lt section name  fastCgi  allowDefinition  AppHostOnly  overrideModeDefault  Allow    gt   lt section name  globalModules  allowDefinition  AppHostOnly  overrideModeDefault  Allow    gt   lt section name  handlers  overrideModeDefault  Allow    gt   lt section name  httpCompression  overrideModeDefault  Allow    gt   lt section name  httpErrors  overrideModeDefault  Allow    gt   lt section name  httpLogging  overrideModeDefault  Allow    gt   lt section name  httpProtocol  overrideModeDefault  Allow    gt    etc

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Resolution fix  For me  the problem was related to active chrome sessions  I closed all of my chrome browser sessions and then tried building to chrome again  I am using Visual Studio Professional 2017 version 15 3 2  The VS application I was running into build errors with was a WebAPI project  When trying to click the green play button  I was getting dialog error stating  Unable to start the program  http   localhost 18980    An operation is not legal in the current state  Hopefully this post helps someone

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The solution to the above problem was a simple one  Close down dev environments  go to Documents folder and rename IISExpress  Now set environment variable  CSRUN DISABLE WORKAROUNDS   ref  http   gauravmantri com 2013 02 05 workaround-for-iis-express-crashing-when-running-windows-azure-cloud-service-web-role-with-multiple-instances-in-windows-azure-sdk-1-8-compute-emulator       Now reboot PC  start VS  load website and run in debug  IIS automatically regenerated the IISExpress folder and the environment variable resolved conflicts

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Another scenario may be that the port that IIS is using for your application is already being used by another running application  Try changing the port and see if it works for you

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I started to get this problem with Asp Net Core Web Applications in Visual Studio 2017  It didn t matter if it was the  Net Core Standard version with  Net 4 5 2 or the Core version with 1 1 in my case  IISExpress crashed when I started debug   Tried everything  nothing worked until I went into add remove programs in Windows 10 and I uninstalled  net core 1 0 runtime  I had both 1 0 installed AND 1 1   Once that was uninstalled  I started Visual Studio 2017 and my  Net Core Web applications  both kinds  and they both started working again

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None of the above answers worked for me but I finally found what my issue was  Hopefully this will help someone down the line   First run IIS Express from command prompt to validate that the site can or cannot be run  https   docs microsoft com en-us iis extensions using-iis-express running-iis-express-from-the-command-line  Im my case  i got an error saying that C  Windows Microsoft NET Framework64 v4 0 30319 CONFIG web config had malformed xml on line 14   Looking at that line in the file it just said null null null null null etc   The fix for me was to replace the web config file with one from my coworkers   IMPORTANT you must get the file from someone running the same version ie if you are VS2015 get a copy from someone running VS2015    If you get it from someone running a different version you will see an error saying it could not load an assembly from the manifest   Hopefully this helps someone that has tried all the suggestions above   I think the cause of this for me was updating from trial mode and adding a product key within VS2017

[asp.net-mvc] ASP.NET MVC5/IIS Express unable to debug - Code Not Running

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