“Unable to launch the IIS Express Web server.” in Visual Studio

Question

I attempted to run my web service through visual studio. I faced an issue like :

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Microsoft Visual Studio
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Answer 1

I had the same problem today, and nothing I found on the internet worked. I have been using port 2057 for years, but suddenly it didn't work any more. Changing it to another low number like 2058 gave same error message, but when I changed it to 20057, everything worked again. Maybe something changed with the way the lower port numbers are handled.