GPM055I

Explanation
A session with the specified partner has been terminated
because of a timeout or an error condition. The specified partner
may be specified as An IP address such as "9.164.181.128"
A symbolic host name such as "smith.boeblingen.ibm.com"
A unix path name such as "/tmp/GPMServe.C00"

System action
The session is terminated immediately.

System programmer response
Make sure that all required prerequisites
for the component are active and operational (for example, TCP/IP).
Make sure that the timeout option in the GPMSRVxx PARMLIB member (TIMEOUT
option) is set properly, and that the DDS host server is active.

Source
Resource Measurement Facility™ (RMF™) - Distributed Data Server (DDS)