[suse-security] X-Problem due to firewall

Hi! Since I'm so paranoic and locked down my whole machine, I have a problem now... I installed SuSE Firewall 2 and configured it. Now, it's really great, noone getting in at all, BUT:¨At my office I use to rsh to a server quite often, and now I don't get the X-forwarding to work anymore, since my firewall blocks just about everything. Where do I have to change what, to get that up and running again? TIA markus