Issue launching IIS Express


I have an issue running IIS express in Visual Studio 2012 and 2015. This is the issue I've been getting:

Unable to launch the IIS Express Web server.
Failed to register URL "http://localhost:55920/" for site "SITE NAME"
application "/".
Error description: The process cannot access the file because it is being 
used by another process. (0x80070020).

I have read the various posts on here and tried the various solutions but they don't seem to work. This is what I have tried:

  • Deleting IISExpress folder.
  • Running Visual Studio as administrator.
  • Deleting .vs folder in the 2015 projects
  • Running netstat or tcpview to find the port that is actually using it is not listed.

These are the only solutions that work:

  • Restarting the computer
  • Changing the port - This works in the short run, but it may throw the same error next time on the new port designation.

I ran these projects before I upgraded my OS, and never had an issue with the ports. For some reason, once I upgraded to Windows 10, I've been encountering this issue. Is there something that went wrong when the OS was upgraded?

asked on Stack Overflow Dec 5, 2016 by pmb88

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