Loosing X ... 'Error: cannot open display: localhost:11.0'

Hello, I hope some may be able to help me finding a solution to this X related problem.
Before Lion everything worked as expected.
From a terminal I
ssh -X user@linuxbox
and it work as expected... all the X application come back to my Mac.
but after a while (generaly not long ... about 5 to 10 min)
I cannot launch any X application anymore.
within my Terminal I get "Error: cannot open display: localhost:11.0"
and  on the linuxbox side I get " sshd[xxxx]: channel 4: open failed: administratively prohibited: open failed"
Running 10.7.1. fully updated (from my 10.6.8 Mac I do not have this problem
... and never had)
Thanks in advance for your help
PhS

'arch' is set as the alias for localhost.  I never entered 'arch' anyway, that's just what the error said.
e:  I tried ssh-ing into a X session on another laptop running an Ubuntu live CD.  I can ssh into it normally, but when I run 'xinit -e ssh -XCT [email protected] gnome-session -- :1' it just starts a new X session on ctrl+alt+F8 using my startx file, rather than the one on the other computer.
Last edited by Yes (2008-07-11 19:17:28)

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    (You can imagine how well these conversations with Adobe Support go...)
    Of course, in this case, it's probably really hard to find the problem. And since it's effectively an end-of-life'd product that is 3 versions behind the released product and at least 4 versions behind the development product, well, it's hard to lose too much sleep over it.
    (*) Yes, I know, this incident would not have been "today." Consider it time dilation.

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