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Editorial Team
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Asked: 2026-05-20T13:48:14+00:00

Today I installed VS2010 SP1 Beta, and IIS 7 Express, as I currently have

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Today I installed VS2010 SP1 Beta, and IIS 7 Express, as I currently have IIS5 on my local development machine and thought I’d try IIS Express out.

I have gone into the properties window for my Web Application, checked the ‘Use IIS Express’ checkbox, created the Virtual Directory when it has prompted me, but then get the message “Unable to launch the IIS Express Web Server. Port x is in use”.

I have tried changing the port number from the default value that was in there, to numerous other port numbers, but whatever value is there, I am always getting this message, and am therefore unable to use the IIS Express Web Server.

Does anyone know what the problem might be, and how to get around it?

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  1. Editorial Team

    If you are using ESET NOD32 Anti Virus, you need to change the setting of “Web access protection” => HTTP, HTTPS => Web browsers => red cross the check box of your devnev.exe (This is three state checkboxs, click the check box until red cross appeared)

    I have just installed VS 2010 SP1, using the above setting to tell NOD32 to leave ‘IIS Express’ alone.

    Reference: http://weblogs.asp.net/anasghanem/archive/2009/02/01/nod32-antivirus-is-blocking-visual-studio-built-in-development-server.aspx

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