DP Express v3.50 sp2 backup fails

[A Browne]

Using DP Express v3.50 sp2 on a Win 2k3 server with an attached HP LTO3 library 960 (af204a) we can backup the local device with no problem.

A similar specification network attached server fails to backup after approx. 40Gb usually with a 'Socket Failure error' although all other operations on this server are continuing as normal.

After this error, if you select 'Continue' from the alert screen, DPE will start hunting for the correct tape usually failing, at this point there seems to be no option but to end the job and start again.

Any ideas much appreciated.