[Networker] Problem with a Windows NT server backup

Here's the story;

One of our last remaining Windows NT 4.0 servers refuses to back up to our
Networker 6.1.1 server (which runs Tru64 Unix). This NT client has an old
Networker client on it, version 5.2. We plan to upgrade the OS on this
server soon, but we recently swapped network cards on it and put a gigabit
card in place of the old 10/100MB card. Actually, both cards are sitting
in different PCI slots in this Gateway PC, but the old card has been
disabled.

Since deploying the new gigabit card, backups of one of this server's four
disk volumes fail ever night. Of course, this g:\ volume that fails
contains the most important data on the system and its the largest volume;
a SCSI raid array. The volume has roughly 11GB of data across nearly
800,000 files. The other volumes are much smaller, but they back up fine.

We have tried setting the gigabit back to 100/full and putting it back on
a port on our switch that operates at that rate. When the system is
connected to a gigabit switch, nor not, backups of this G:\ volume fail
after spending about three hours writing data to tape. The failure looks
network related to me because of the RPC error.

Here's the error message:

* smaug:G:\ 5 retries attempted
* smaug:G:\ save: RPC error, Unable to send
* smaug:G:\ save: Send Chunk to MMD failed, Connection reset by peer
* smaug:G:\ save: save failed on
G:\Programs\WebMail\USERS\jarmul AT temple DOT edu\USER.BAK

Does anyone know how we can get this backup to work with the gigabit
ethernet connection? It seems as if our only option to get a good backup
of all this server's volumes is to revert to the old network card.

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