I'm the network guy so my idea of MQ is not that broad but I'll try:
Have you done refresh security - we rebooted the MQ server
What application programming language - C++\VB
Client mode or binding ...
one of my apps connect MQ on a different domain
all the users added to MQ & having no problems connecting
there is 1 user that worked fine until few days ago then she started getting this messag ...
we have 3 domains: production, old & new domain
we started moving people from tyhe old to new domain but have a problem on MQ side.
if the username (ID as MQ refer to it) is identical on both do ...