You may find the following documents helpful in order to find
the reason for your error:
The network protocol error (39) is mentioned in
http://support.veritas.com/docs/277013and in
http://support.veritas.com/docs/285939(..)
Etrack Incident = ET814644Associated Primary Etracks = ET797945Description:
The inventory operation, using vmphyinv, was failing with a network
protocol error (39). This was because oprd was crashing. After fixing the
core dump, other issues were encountered (and fixed) because of which tape
header was not being read correctly.
(..)
Google is your friend . Try search string : "network protocol error (39)"