Explanation: An attempt to write data to a vmd socket failed. vmd is the NetBackup Volume Manager daemon (UNIX and Linux) or NetBackup Volume Manager service (Windows).
Examine command output (if available) and the daemon and reqlib debug logs for a more detailed message on the error.
Identify the system where vmd is running. The system usually is termed the Media Manager host or EMM server and defaults to the local system in some user interfaces (such as vmadm). Possible causes for the error are high network load, missing operating system patches or service packs, or unexpected vmd process failure.