“This site is running teamviewer”

Probably you have seen the above message when you try to connect to locally hosted pages by typing “localhost” in the browser. This happens if you have teamviewer installed, which listens on port 80 by default. One of my colleagues got this message today and asked what he should do to fix it. Simply you can try terminating the teamviewer process or you should permanently make teamviewer listen on some other port. Go to Extras -> Options -> Advanced  -> Show Advanced Options -> Advanced Network Settings in teamviewer UI and check “Don’t use incoming ports 80 and 443”. Now you should be able to work on your sites on localhost.