Unable to launch the ASP.NET development server because port '49351' is in use

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An Error Occured launching IIS Express
Unable to launch the ASP.NET Development server because port '49351' is in use

What I have tried:

An Error Occured launching IIS Express
Unable to launch the ASP.NET Development server because port '49351' is in use

I tried to restart visual but nothing, ANd when i changed PortNumber the Error is
unable To Connect Web Service IIS Express

Posted 22-May-21 7:31am

ahmedbelal

Updated 22-May-21 22:37pm

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[no name] 22-May-21 20:02pm

Maybe it's already running (on that port). Or there's a memory leak and you need to restart VS.

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Sandeep Mewara · Answer 1 · 2021-05-22T22:37:00

Mostly, it is because visual studio processes (webdev.webserver.exe) is still running and locked. Restarting VS wouldn't help, though system should surely.(easiest solve)

In case you don't want to restart, you can do either of the following:
1. In the bottom icon task bar, right click each of these webservers running and stop them
2. In the task manager processes, kill all the webdev.webserver.exe processes

Lastly, rare instances has been related to antivirus related. If you get this kind of issue almost every time then you might need to add VS/IIS in your antivirus safe list.