Same here :(
I'm looking for a solution but I can't find it... what i've done already:
- Disabled firewall
- Reset router and modem
- Internet connection is fine
- Other games, like BF:BC2, work just fine
- Created a new ArmA2 profile
- Joining with, or without mods doesn't make any difference
- Reinstalled ArmA2 + patch 1.05, no difference :(
- untill friday I could play without any problem, since then I didn't play ArmA2 untill now, only thing I did is updating with Six updater but is that the problem?