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

Question

I was developing just fine in VS 2008 and testing my ASP.NET web site on my development server when suddenly I was unable to run my web site anymore. As soon as I hit F5, th

Answer 1

One thing I have tried in the past when this type of thing happened is telneting to the port and doing a GET or HEAD:

telnet localhost 1900

Then type in HEAD and press enter. Sometimes the data returned shows something like a server name or an application name.