Explanation: The bpsynth process cannot open a socket to listen for incoming connections from the bptm or the bpdm processes that were started for the following: for reading backup images or for writing the synthetic image on the media servers.
Recommended Action: Check the OS error that was reported in the error message, which bpsynth logged in the NetBackup error log. This error helps to diagnose the problem. Ensure that the bpsynth binary matches the installed NetBackup version. Retry the synthetic backup job. If the problem persists, contact customer support and provide the 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.