Explanation: This error is returned when no message is received from bptm process in response to the command or query executed by using bptm.
Recommended Action: Look for additional error messages in the following logs: the NetBackup error log and the debug logs for bpsynth on the master server and bptm on the media server. A system condition (insufficient memory, file system full, insufficient swap space) on the media server may prevent the bptm process from sending the response. Verify the network connectivity between the master and the media server. If no explanation is found for the failure and the problem persists, contact customer support and send appropriate logs.
A complete list of required logs and configuration information is available.
See "Logs To Accompany Problem Reports for Synthetic Backup" in the Troubleshooting Guide.