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IIS Express refuses to start RRS feed

  • Question

  • I keep getting this error when trying to launch an ASP.Net application from Visual Studio:

    Failed to register URL "http://localhost:50019/" for site "E2" application "/". Error description: The process cannot access the file because it is being used by another process. (0x80070020)

    I tried to see if the port is being used

    C:\>netstat -ao | findstr 5019

    No results

    Event Viewer says

    The worker process for app pool 'Clr4IntegratedAppPool', PID='15752', failed to initialize the http.sys communication when asked to start processing http requests and therefore will be considered ill by W3SVC and terminated.  The data field contains the error number.

    I've changed the port.  I've reinstalled IIS Express several times now.  I've rebooted.  I've looked through tons of answers on Stack Overflow.  It used to work.

    Any help would be appreciated.  I have a suspicion that this might have to do with OneDrive which I recently enabled.

    IIS Express 10

    VS 2019


    • Edited by Blue Baron Tuesday, June 25, 2019 7:59 PM
    Tuesday, June 25, 2019 7:53 PM