IISExpress returns a 503 error from remote machines

It looks like you are missing a binding information entry in applicationhost.config file.

  1. Open your applicationhost.config file. Possible locations are:

    • %userprofile%\Documents\IISExpress\config\applicationhost.config
    • $(solutionDir)\.vs\config\applicationhost.config (VS2015)
    • Failing that, inspect the output from iisexpress.exe to be sure.
  2. Locate your WebSite entry and add following binding with your machine name.

         <binding protocol="http" bindingInformation=":50333:your-machine-name" />
    
  3. Restart IIS Express

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