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:


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


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.


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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