Backup fails with error 23, when it runs from media server

Hi,

I'm getting socket read error.

Master is 7.1.0.3 - Solaris

Media is 6.5 - HP UX

Client is 6.5 - HP UX

All host entry is fine and checked more that twice.

when i issue bpclntcmd -hn <hostname>,---------i'm getting error HOST NOT FOUND.

Important note is backup is running from Master but not from media server.

Pls post your suggestion.

Thanks