I like passwords, I really do, but on a queue manager that only is used in a proof-of-concept or a demo, I feel that password checking is unnecessary. So because of this and that I can not make myself remember how to do it I put the solution here
The solution is to alter the SYSTEM.DEFAULT.AUTHINFO.IDPWOS CHCKCLNT parameter to NONE or OPTIONAL. This can be done using runmqsc, or MQExplorer if you like a GUI instead
ALTER AUTHINFO(SYSTEM.DEFAULT.AUTHINFO.IDPWOS) AUTHTYPE(IDPWOS) CHCKCLNT(OPTIONAL)
and after that we need to make sure the new setting is in affect
REFRESH SECURITY
Tested on IBM MQ 9.0.4.0 and RHEL 7
it worked for me, thanks