Data Protector [CONFIGURATION] Backup problem

[pmpfe]

When using the filesystem backup set, we get:

Lost connection to VBDA named "ptliswsa042.prg-dc.dhl.com "
on host ptliswsa042.prg-dc.dhl.com.
Ipc subsystem reports: "IPC Read Error
System error: Connection reset by peer

Disk agent, media agent and cell manager are all the same machine.

Would anyone have a clue on what the problem might be?

Thankfully,
Paulo