Unable to launch the ASP.NET Development server because port '1900' is in use.

Posted by Shaul on Stack Overflow See other posts from Stack Overflow or by Shaul
Published on 2009-02-01T15:02:34Z Indexed on 2010/03/24 1:03 UTC
Read the original article Hit count: 600

Filed under:

visual-studio

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ASP.NET

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web-development-server

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asp.net-development-serv

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configuration

I don't know what has got into my computer today. I was developing just fine in VS 2008 and testing my ASP.NET web site on my development server.

Then suddenly, out of the blue, I can't run my web site any more! As soon as I hit F5, the message appears: Unable to launch the ASP.NET Development server because port '1900' is in use. And it doesn't matter what port I change to, it's always in use! AAARRRGGGHH!!!

I have tried:

Changing the port number
Restarting Visual Studio
Rebooting my machine
Installing IIS

Clue: My IIS refuses to start. But I didn't have IIS installed when I was happily working earlier, so that is probably not the issue; it might just be highlighting something else...

Thanks in advance...

Update: after rebooting, IIS does start, but the problem here persists.

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