I attempted to run my web service through visual studio. I faced an issue like :
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Microsoft Visual Studio
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The easiest first pass at this without getting into the command console is to just shut down all applications (including VS), then launch VS by itself and try it again. There is likely another application like your browser causing the conflict. In my case Chrome caused it and was solved when shutting everything down and restarting VS. I opened Chrome again and everything was fine.
The netstat stuff above is useful, but to me that's only if you can't do what I'm suggesting.