Visual Studio error - Unable to start debugging on the web server. Operation not supported. Unknown error. 0x80004005

 

I was trying to run my application hosted in IIS from Visual Studio. On pressing F5, it gave me the following error: "Unable to start debugging on the web server. Operation not supported. Unknown error. 0x80004005"

 

 

 

 

 

 

Go to the Application Pool in IIS by which your application is running. Right click -> Advanced Settings.  Enable 32-Bit Applications to True.

 

Comments

• Anonymous
  March 20, 2016
  This approach didn't work for me. Still getting the same error. Any further suggestions?
  • Anonymous
    April 05, 2016
    Are you still facing issues?
  • Anonymous
    July 14, 2016
    I already had Enable 32-Bit Application set to true when this happened.