...
A simple way to check if your display forwarding is okay is to execute the command:
xclock
If this opens a little window with a clock your setup is good.
If you do not get the little clock window check the following:
a) When using ssh make sure you used it either with the ' -Y ' key (plus -C for better compression)!
ssh -YC ...
b) Check your home quota with (see "Disk quota exceeded in your home" above for more info):
quota
If you are over quota in your home you cannot open any windows. To reduce the data in your home check point "Disk quota exceeded in your home" above.
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Stack overflow
Error message:
"stack overflow: thread 0, max 10228KB, used 1147KB, request 37324944B"
=> unlimit your stack by setting:
ulimit -s unlimited
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X11 connection rejected because of wrong authentication
Error message:
"X11 connection rejected because of wrong authentication."
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Check with: quota -v
Error: Can't open display: localhost:...
Error message:
"Error: Can't open display: localhost:..."
...