Are you able to work on that UNIX server? to log on using SSH and to browse MQM settings? If not, can you ask MQM support to do it?

So MQM is not on zOS but on UNIX. It doesn't solve enything but is good to know.

Please try without specifying user name as I suggested and post/email created log. We need generated error info to pinpoint this issue.

That is strange. Log should show us MQ connect error.

Lets go try different approach.

Please remove user credentials from connect connection definition and see what will happend. I just did it and it generates 2035-MQRC_NOT_AUTHORIZED error dispalyed and written in log.

Then post log again.

Can you post complete log to see all problematic steps reported? It would be nice if you can attach/send complete log file.

I am not a developer of MQ Explorer Plus, Bertrand Giot is. I am only helping him test it, especially on zOS.

This proxy question should wait for Bertrand to answer, sorry.

Anyway, post your log so we can analyze it.

Check then in user's Local profile in Dot Consulting\MQ Explorer Plus For Websphere\Logs

Can you, please, post a log file? It is in C:\ProgramData\Dot Consulting\MQ Explorer Plus For Websphere.

True. I assume IP address, port and channel are correct too.

Are you using same logon credentials as on zOS?