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Asked: 2026-05-24T00:25:06+00:00

I’m playing around with a WCF service. The problem I’m having is that VS2010

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I’m playing around with a WCF service.

The problem I’m having is that VS2010 keeps randomly assigning a new port number to it when starting the VS Development Server even though I have set it to a specific port through the project settings.

If I keep stopping and starting VS Development Server for a few times with this problem, I get an error that says Unable to launch the ASP.NET Development server because port ‘xxxx’ is in use.

Why is this happening?

edit: It was suggested that this could be caused by the Dev Server not stopping. Unfortunately, it happens on a freshly started computer as well, i.e. when no instances of it are running at all.

Also, after I get the error message, it doesn’t matter if I change the port, or select the Auto-assign Port option. The result is the same.

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1 Answer

  1. Editorial Team

    It turns out that the problem was linked to the issue answered at Visual Studio Development Server using wrong port.

    I didn’t suspect this to be the cause because I didn’t have a blanket problem. I could launch the WCF solution at times, but not at certain other times. I could also run an instance of the Dev Server for an MVC solution with a specific port applied without problems.

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