[Bacula-users] FD Errors on Win2003

Hello,
I'm having trouble with a win2003 client running the agent.
From time to time only that client stops the backup with the following error:

09-Jan 03:03 smartlink-dir: Enterprise_Backup_OFFICE.2009-01-08_21.50.00 Fatal error: Network error with FD during Backup: ERR=Connection reset by peer
09-Jan 03:03 smartlink-sd: Enterprise_Backup_OFFICE.2009-01-08_21.50.00 Fatal error: append.c:159 Error reading data header from FD. ERR=Connection reset by peer
09-Jan 03:03 smartlink-sd: Job write elapsed time = 01:34:39, Transfer rate = 9.796 M bytes/second
09-Jan 03:03 smartlink-dir: Enterprise_Backup_OFFICE.2009-01-08_21.50.00 Fatal error: No Job status returned from FD.
09-Jan 03:03 smartlink-dir: Enterprise_Backup_OFFICE.2009-01-08_21.50.00 Error: Bacula smartlink-dir 2.2.2 (06Aug07): 09-Jan-2009 03:03:35
Build OS:               i386-pc-solaris2.10 solaris 5.10
JobId:                  858
Job:                    Enterprise_Backup_OFFICE.2009-01-08_21.50.00
Backup Level:           Full
Client:                 "office-fd" Windows Server 2003,MVS,NT 5.2.3790
FileSet:                "officeFileSet" 2008-12-22 21:50:00
Pool:                   "ThursdayPool" (From Run pool override)
Storage:                "QUANTUM" (From Job resource)
Scheduled time:         08-Jan-2009 21:50:00
Start time:             09-Jan-2009 01:28:52
End time:               09-Jan-2009 03:03:35
Elapsed time:           1 hour 34 mins 43 secs
Priority:               10
FD Files Written:       0
SD Files Written:       71,801
FD Bytes Written:       0 (0 B)
SD Bytes Written:       55,635,942,980 (55.63 GB)
Rate:                   0.0 KB/s
Software Compression:   None
VSS:                    no
Encryption:             no
Volume name(s):         GIOVEDI2
Volume Session Id:      4
Volume Session Time:    1231408365
Last Volume Bytes:      246,756,142,080 (246.7 GB)
Non-fatal FD errors:    0
SD Errors:              0
FD termination status: Error
SD termination status: Error
Termination:            *** Backup Error ***

As you can see, the machine was backed up for almost 1 hour and half.
This happened 10-12 times in the last few months.
I already investigated any possible network problem or anything out of Bacula happening during the night (when backup runs). There doesn't seem to be any other problem.
What may be the cause?

thanx for any help.
Gabriele.

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