DFS2161I LINK xxx STOPPED BY PARTNER.
Explanation
Link xxx was stopped at the request of the other system attached to it. The other system might be shutting down, or the master terminal operator might have entered a /PSTOP LINK command.
System action
Output messages are queued on this link, but none are sent.
Operator response
(master terminal) Issue a /RSTART LINK command to put the link back into operation. The master terminal operator in the other system must do the same before message transfers will begin.