Your comments
Anything in logs? On either side?
It should recognize -a in lsb_release. Ask them to run cat /etc/redhat-release then.
Please try without user ID too. Both user ID and password should be empty.
Which Linux brand/distribution is that?
You can try with lsb_release --all .
OK, it is Linux, not UNIX, similar but not the same.
Can you ask for output of command lsb_release -a ?
Sebastian, I ment the UNIX server data on which MQ is running, not the MQ server data.
Please ask for UNIX OS specs. I can maybe reproduce it in my environment.
BTW, can you get more info on MQM UNIX server - UNIX brand, version, ...?
Customer support service by UserEcho
Very strange.
Can you, please, post IBM Explorer Connection Details -> Properties tab screen shot?