Hey guys & girls.
After Mountain Lion 10.8.4 installation on my CustoMac i had one problem ( everything else works ) - When i open iMessage my internet stops working. ( pages won't open, another services are unavailable etc )
I read a lot of tutorials about 'how to fix imessage', but i haven't found really useful information, because i don't want to use Clover.
So, it's very simple.
Open iMessage application, go to Preferences, and uncheck 'Enable Bonjour', also login into your account. ( See screenshot ).
Thanks for reading. I haven't found tutorials like this one. I hope it helps.