Problem with X11 forwarding on Debian Squeeze

Few weeks ago I experienced problems with my X11 forwarding on Debian Squeeze, after googling and tried to solve my problem, I found an issue here. Actually, disabling ipv6 makes X11 over ssh crashes. So if you want to make X11 forwarding works, you just have to add the following line in your /etc/ssh/sshd_config

AddressFamily inet

Hope it helps ;-)