Error:

Failed to register URL “http://localhost:XXXX/” for site “SITE NAME” application “/”. Error description: The process cannot access the file because it is being used by another process. (0x80070020)

**XXXX = port number

Reason for this error:

This error happens to me because I was using same solution for different project. I copied the solution and created another one in different location.

I have done several another projects in same way, however, I didn’t face this error earlier. I think, the localhost with the port has been researved for the previous actual solution. Since I created seperate project in TFS and then clone the solution local location with same solution name in different location.

Resolution:

Solutions Explorer

Right click on project select Unload project

Again Right click and select Edit ProjectName.csproj

remove these 3 lines

<DevelopmentServerPort>0</DevelopmentServerPort>
<DevelopmentServerVPath>/</DevelopmentServerVPath>
<IISUrl>http://localhost:62940/</IISUrl>

Save and reload the project

Then, you will get new port for the project.

If you find any another solution, please comment.

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