Dotnet exe ошибка

I am attempting to setup a new work space and transfer all of my projects from my old computer to the new one. However, I am getting this error when I try to run IIS Express:

Unable to start process C:\Program Files\dotnet\dotnet.exe. The web
server request failed with status code 500.

I am working in Visual Studio 2015, update 3 and I am using .NET Core RC2. Does anyone have any idea how to fix this and get my old projects running on this new machine?

I was having the same problem. I look for dotnet.exe in that directory and it exists but debugger cannot execute it, so i Restart Visual Studio 2015 as administrator and it works!

Just close VS delete the project.lock.json file, open VS the file will be restored and you shouldn’t have problems anymore.

in my case. i choose «ProjectName» instead of «IIS Express» while running/debugging. and it works/open with a console output window and selected browser, keep console output window open while debugging. Hope this will work.

Visual Studio 2017 -> The fix for me was to choose the Project Name instead of IISExpress when debugging/running.

answered Jun 3, 2017 at 10:55

In your startup project be sure that you have selected the option Enable Anonymous Authentication

answered Mar 19, 2018 at 5:54

answered Jun 13, 2017 at 18:38

I was able to fix the error by removing $(solutionDir).vs\config\applicationhost.config. After restart VS 2017 recreated the file.
The file became invalid after I moved the solution from one location to another.

Thanks to https://elanderson.net/2016/09/unable-to-start-process-dotnet-exe/ for the idea.

answered Sep 25, 2017 at 21:41

It is caused by a wrong Path in applicationhost.config file, this file you can find inside your project folder. Go to your project folder. There you will find a .vs named folder, if you can not find it then in folder open You have to Uncheck Hidden folder. Once you have found it navigate to config folder there you find applicationhost.config. Open this file in notepad and provide your project location like that:-

<virtualDirectory path="/" physicalPath="c:\users\*****\documents\visual studio 2015\Projects\<ProjectFolderName>\<Projectname>" />

Hope this will help you.

Solution for me (without administrator rights) was to:

• Close all instances of visual studio 2017
• Open project
• Clean
• Rebuild
• Run

answered Sep 13, 2017 at 9:32

VS2017 and solution has .NET Core 1.1 web applications.

This did not help: Deleting .VS folder, removing all bin directories, restarting VS.

This helped: Installed latest SDK (.NET Core SDK 1.0.4) this issue got resolved.

I got this issue all of a sudden after a machine reboot followed by installing PHP for IIS, IIS URL Rewrite. But just try reinstalling the SDK – it might work fine with that itself, instead of going for the latest SDK.

answered Aug 15, 2017 at 10:25

answered Aug 22, 2018 at 8:42

In my case I accidentally install dotnet for x86 platform when my VS 2017 have x64. I reinstall dotnet for platform x64 and it works fine now.

If using IIS instead of IIS Express, just restart the service or:

1. open IIS
2. open your project folder from Sites tree view
3. select site
4. in Manage Websiteclick on Restart button

answered Apr 30, 2019 at 15:25

For whom is having problem with Visual Studio 2019 because was using the previous version of Visual Studio, jus delete the .vs folder that is in the root of the project and rerun the application, the problem must be resolved. That worked for me.

1. I have removed the .vs folder from the project folder. It solved my issue.
2. The .vs folder will be created when the project runs

answered May 28, 2021 at 3:54

In my case I have a few projects in one solution and none of them has been set up as startup project.

So, just right-click on project (not solution!) as choose Set as StartUp Project.

answered Oct 26, 2017 at 9:53

In my case there was a setting in web.config and timeout was not defined properly, TFS placeholder was there instead of actual value requestTimeout="00:06:00"

Here is what it looks like. Hope it will be helpfull

<system.webServer>
    <handlers>
      <remove name="aspNetCore"/>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" requestTimeout="00:06:00" />
    <httpRedirect enabled="false" />
  </system.webServer>

answered May 30, 2018 at 7:21

answered Nov 23, 2018 at 15:43

In my case, I just change modules="AspNetCoreModuleV2" to modules="AspNetCoreModule" and working fine. The final web.config looks like as below.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false" startupTimeLimit="3600" requestTimeout="23:00:00">
      <environmentVariables />
    </aspNetCore>
    <httpProtocol>
      <customHeaders>
        <remove name="X-Powered-By" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>
</configuration> 

answered Mar 1, 2019 at 10:40

answered Sep 26, 2019 at 17:49

My problem resolved by:

Goto: .vs\config\applicationhost.config file
and set overrideModeDefault to Allow instead of Deny

<section name="windowsAuthentication" overrideModeDefault="Allow" />

answered Sep 27, 2019 at 9:46

looks like you don’t have <appSettings> tag in your web.config. If you add that you will be able to resolve this problem.

For Example :

<appSettings>
<add key="TestKey" value="TestValue"/>

answered Oct 10, 2019 at 10:42

answered Nov 14, 2019 at 15:29

I am attempting to setup a new work space and transfer all of my projects from my old computer to the new one. However, I am getting this error when I try to run IIS Express:

Unable to start process C:\Program Files\dotnet\dotnet.exe. The web
server request failed with status code 500.

I am working in Visual Studio 2015, update 3 and I am using .NET Core RC2. Does anyone have any idea how to fix this and get my old projects running on this new machine?

I was having the same problem. I look for dotnet.exe in that directory and it exists but debugger cannot execute it, so i Restart Visual Studio 2015 as administrator and it works!

Just close VS delete the project.lock.json file, open VS the file will be restored and you shouldn’t have problems anymore.

in my case. i choose «ProjectName» instead of «IIS Express» while running/debugging. and it works/open with a console output window and selected browser, keep console output window open while debugging. Hope this will work.

Visual Studio 2017 -> The fix for me was to choose the Project Name instead of IISExpress when debugging/running.

answered Jun 3, 2017 at 10:55

In your startup project be sure that you have selected the option Enable Anonymous Authentication

answered Mar 19, 2018 at 5:54

answered Jun 13, 2017 at 18:38

I was able to fix the error by removing $(solutionDir).vs\config\applicationhost.config. After restart VS 2017 recreated the file.
The file became invalid after I moved the solution from one location to another.

Thanks to https://elanderson.net/2016/09/unable-to-start-process-dotnet-exe/ for the idea.

answered Sep 25, 2017 at 21:41

It is caused by a wrong Path in applicationhost.config file, this file you can find inside your project folder. Go to your project folder. There you will find a .vs named folder, if you can not find it then in folder open You have to Uncheck Hidden folder. Once you have found it navigate to config folder there you find applicationhost.config. Open this file in notepad and provide your project location like that:-

<virtualDirectory path="/" physicalPath="c:\users\*****\documents\visual studio 2015\Projects\<ProjectFolderName>\<Projectname>" />

Hope this will help you.

Solution for me (without administrator rights) was to:

• Close all instances of visual studio 2017
• Open project
• Clean
• Rebuild
• Run

answered Sep 13, 2017 at 9:32

VS2017 and solution has .NET Core 1.1 web applications.

This did not help: Deleting .VS folder, removing all bin directories, restarting VS.

This helped: Installed latest SDK (.NET Core SDK 1.0.4) this issue got resolved.

I got this issue all of a sudden after a machine reboot followed by installing PHP for IIS, IIS URL Rewrite. But just try reinstalling the SDK – it might work fine with that itself, instead of going for the latest SDK.

answered Aug 15, 2017 at 10:25

answered Aug 22, 2018 at 8:42

In my case I accidentally install dotnet for x86 platform when my VS 2017 have x64. I reinstall dotnet for platform x64 and it works fine now.

If using IIS instead of IIS Express, just restart the service or:

1. open IIS
2. open your project folder from Sites tree view
3. select site
4. in Manage Websiteclick on Restart button

answered Apr 30, 2019 at 15:25

For whom is having problem with Visual Studio 2019 because was using the previous version of Visual Studio, jus delete the .vs folder that is in the root of the project and rerun the application, the problem must be resolved. That worked for me.

1. I have removed the .vs folder from the project folder. It solved my issue.
2. The .vs folder will be created when the project runs

answered May 28, 2021 at 3:54

In my case I have a few projects in one solution and none of them has been set up as startup project.

So, just right-click on project (not solution!) as choose Set as StartUp Project.

answered Oct 26, 2017 at 9:53

In my case there was a setting in web.config and timeout was not defined properly, TFS placeholder was there instead of actual value requestTimeout="00:06:00"

Here is what it looks like. Hope it will be helpfull

<system.webServer>
    <handlers>
      <remove name="aspNetCore"/>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" requestTimeout="00:06:00" />
    <httpRedirect enabled="false" />
  </system.webServer>

answered May 30, 2018 at 7:21

answered Nov 23, 2018 at 15:43

In my case, I just change modules="AspNetCoreModuleV2" to modules="AspNetCoreModule" and working fine. The final web.config looks like as below.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
    </handlers>
    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false" startupTimeLimit="3600" requestTimeout="23:00:00">
      <environmentVariables />
    </aspNetCore>
    <httpProtocol>
      <customHeaders>
        <remove name="X-Powered-By" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>
</configuration> 

answered Mar 1, 2019 at 10:40

answered Sep 26, 2019 at 17:49

My problem resolved by:

Goto: .vs\config\applicationhost.config file
and set overrideModeDefault to Allow instead of Deny

<section name="windowsAuthentication" overrideModeDefault="Allow" />

answered Sep 27, 2019 at 9:46

looks like you don’t have <appSettings> tag in your web.config. If you add that you will be able to resolve this problem.

For Example :

<appSettings>
<add key="TestKey" value="TestValue"/>

answered Oct 10, 2019 at 10:42

answered Nov 14, 2019 at 15:29