If you are unable to access www.haxball.com, you can still try to play haxball by using a direct room link and replacing www.haxball.com with test2.haxball.com
If you're using OpenDNS then don't. Use Google DNS like a normal person.
If you don't know how to do this:
http://www.howtogeek.com/164981/how-to- ... -browsing/
https://developers.google.com/speed/pub ... docs/using