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To be more clear: it IS a Bug!
so this is the bug:
you must not genereate links like "http://MYCOLLABIP/some/link.xyz"
BUT:
"/some/link.xyz"
in the latter case, the link is relative and stays correct and is independent from machine-IP
Ah, this does NOT WORK.
If I do so, then it is no longer reachable from inside :(
Customer support service by UserEcho
I solved the problem: i use kanboard now.
i am sorry.
regards,
xibeaga