no remote X after upgrades to 9.1/9.2

I have 2 Opteron machines. Both were running Suse 9.0 amd64. I upgraded one to Suse 9.1 and the other to Suse 9.2. Now I cannot open X applications remotely when using rlogin. I get the "cannot connect to X server" even after using xhost + and setting the DISPLAY env variable on the remote machine. I am aware that ssh -X is preferable - and that does seem to work between my Suse boxes - but not all machines are configured properly as ssh servers. We are behind a firewall here, and we also have some machines on private lans, so if there is a way around this I would like to know. Thanks, Joe