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After forwarding a port to use for murmur, and testing it out via azureus and a couple of other programs, it is ok to use. But then I use it for my murmur server and it can't use it.
The strange thing is that it was working fine until today.
OS and mumble version?
Any important software update?
Have you tried changing the port murmur uses in murmur.ini?
Can you try to run murmur in verbose mode from the console (murmur -v -fg) and see if output gives any clue?
Also be aware that murmur uses both TCP and UDP. Both need to be forwarded and both need to be the same port.