Samba Drops Connections

[Matthew Halliday]

Hi people - 

I'm having problems with Samba dropping connections on the network. 
We've recently installed a Cisco Catalyst switch, if that makes a
difference, but the log for one of the machines is as follows - 

52
[2000/09/13 12:09:28, 1] smbd/service.c:close_cnum(557)
  h77 (0.0.0.0) closed connection to service xx
[2000/09/13 12:09:35, 1] smbd/service.c:make_connection(521)
  h77 (12.1.1.23) connect to service xx as user xx (uid=xxx, gid=xxx)
(pid 23254)
[2000/09/13 12:09:45, 0] smbd/oplock.c:oplock_break(905)
  oplock_break resend
[2000/09/13 12:09:55, 0] smbd/oplock.c:oplock_break(905)
  oplock_break resend
[2000/09/13 12:10:05, 0] smbd/oplock.c:oplock_break(905)
  oplock_break resend
[2000/09/13 12:10:15, 0] smbd/oplock.c:oplock_break(922)
  oplock_break: receive_smb timed out after 30 seconds.
  oplock_break failed for file XXXXXX.XLS (dev = 806, inode = 1550639).
[2000/09/13 12:10:15, 0] smbd/oplock.c:oplock_break(992)
  oplock_break: client failure in break - shutting down this smbd.
[2000/09/13 12:10:15, 1] smbd/service.c:close_cnum(557)
  h77 (0.0.0.0) closed connection to service xx
[2000/09/13 12:10:21, 1] smbd/service.c:make_connection(521)
  h77 (12.1.1.23) connect to service xx as user xx (uid=xxx, gid=xxx)
(pid 23309)
[2000/09/13 12:12:52, 0] smbd/oplock.c:oplock_break(905)
  oplock_break resend
[2000/09/13 12:13:02, 0] smbd/oplock.c:oplock_break(905)
  oplock_break resend
[2000/09/13 12:13:12, 0] smbd/oplock.c:oplock_break(905)
  oplock_break resend
[2000/09/13 12:13:22, 0] smbd/oplock.c:oplock_break(922)
  oplock_break: receive_smb timed out after 30 seconds.
  oplock_break failed for file XXXXXX.XLS (dev = 806, inode = 1550639).
[2000/09/13 12:13:22, 0] smbd/oplock.c:oplock_break(992)
  oplock_break: client failure in break - shutting down this smbd.
[2000/09/13 12:13:22, 1] smbd/service.c:close_cnum(557)
  h77 (0.0.0.0) closed connection to service xx

and so it goes on....

We don't use oplocks - and several shares specify oplocks = no.  The
problem with this is that it seems to happen to important
management-type people saving large files and big Excel spreadsheets at
the most inconvenient times.  This means that when they go to open them
they get presented with a message saying that the file format isn't
recognised and it's all my fault - of course.  I then have to restore
the last good one from last night's backup.  

We've got PC running an eval. of Win2000 Server on the network, but it's
not set up to do anything particularly.  Would that have an effect?  Can
anyone shed any light on this?

Matt
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