Feb 5, 2015

IIS unable to start Web Site: HRESULT: 0x80070020 & how to know what is using port 80.

If you hit this error when trying to start your IIS Web:

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Take a look at your Windows Event Viewer: it can tell more:

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So in my case, it is :unable to bind to port 80. My suspect is some program is using it. Luckily, TCPView from Sysinternals do a great job in reporting port usage.

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It turns out Skype is listening on port 80, which prevent IIS from starting up. OK change Skype port and everything is working fine again.

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