First, assure that the CA Datacom MUF is up and enabled.
Check the MUF jeslog for message:
DB00201I - MULTI-USER ENABLED, CXX=…
To see if XCF is activated, check the MUF jeslog for message:
DB00226I - MULTI-USER ACTIVATED XCF SUPPORT ...
Then, submit from the remote Lpar a batch CA Datacom DBUTLTY job with SYSIN of COMM OPTION=STATUS.
You can add JCL /*JOBPARM SYSAFF=remoteLpar to assure that it really executes in the remote Lpar.
This saves actually starting the user application until communication can be confirmed and any problems can be addressed.
If the MUF is up and the XCF communication is successful, the DBUTLTY job output will return showing a status, whether there are no or some active tasks running in the MUF.
If the MUF is not up or was not properly customized for XCF, you will get a Datacom RC 68 and the DBUTLTY job will terminate within the time delay for RC 68:
DB00121I - UNAVAILABLE – mufname
DB00122I - ACCESS TYPE - LOCAL TASKS=1
DB00123I - WAITING FOR MUF AVAILABILITY
DB00124W - REMAINING DELAY68 TIME - 2 MINUTES
DB00501E - OPEN ERROR - RETURN CODE 68 (001) CXX