[Solved] Error: Server not found Firefox can’t find the server in ASP.Net

All my sites are working when i run them except one that sudenly start showing error when i run it, please am i been hacked?

Server not found

Firefox can’t find the server at mysearch.avg.com.

Check the address for typing errors such as ww.example.com instead of www.example.com If you are unable to load any pages, check your computer’s network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.