Hg serve - An attempt was made to access a socket that was denied by its access permissions

I am sure there are several reasons why this can happen, but I found one of them: I use Sony VAIO and when "VAIO Care" is installed and running on your computer, it blocks port 8000 and causes this error when you try " hg serve "in one of your repositories. In particular, when VCsystray.exe is manually terminated, this error stops when hg serve is executed. I thought that I should pass this information if someone else ran into the same problem.