As far as I understand it, X forwarding is usually pretty simple. Once I can run some things like
gimp over ssh, complex applications like
iceweasel should also be able to run. However, I have one notebook from where I can't get a forwarded iceweasel (or icedove) session via ssh and X forwarding.
Background info in this question: Newer versions of Mozilla (Iceweasel / Icedove) not working when X forwarding is used
Since this may either be a bug in mozialla iceweasel and icedove for new-ish versions, or an issue with X (forwarding) on the one particular notebook, or a feature of X forwarding that's required by just some applications, I feel I need to debug the issue thoroughly.
I need advice on how to debug. Things like calling ssh using the verbose option. Log files to look at while calling the nonfunctional X-forwarded applications. There has to be some clue, somewhere.