Export DISPLAY works from linux boxes but not from unix
I have just installed Redhat WS on my laptop that was previously Mandrake 10.1. What I have found is that I can still export a display from other linux machines (Redhat, Fedora, Suse), but cannot any longer from Solaris 8, 9 or HP-UX. I have X11 forwarding set to yes, connectivity is there. On the Solaris 9 machines I tried via telnet as well as ssh. I've used ssh -X and -Y. My /etc/hosts contains entries for all the machines I work with. I have set xhost + just to make sure I'm not blocking. I have tried :10.0 and :10.1 as well as :0.0 I have turned off firewall and disabled selinux.
I've googled this thing to death and have not come up with an answer, although I know that it will be something exceedingly simple.
Any help will be greatly appreciated.