It is a feature ... really, it is (according to RH) :). Here is a quote from the RH mailing list:
I think by default X11Forwading is now disabled in SSH. You can either use 'ssh -X' or change it in your /etc/ssh/ssh_config. I have the following in mine:
ForwardX11 yes ForwardX11Trusted yes
That should make it work the way you expect.
YES YES YES
by default ForwardX11 yes ForwardAgent yes ForwardX11Trusted no
so you have to change to ForwardX11Trusted yes
and voila it works
Thank you
Petr Klíma
JIHOMILK a.s. Rudolfovská 246/83 370 50 České Budějovice Czech Rpublic
phone: +420 389 136 209 e-mail: petr.klima@jihomilk.cz