[Samba] Error Code -36

[samba.200.ssteve at spamgourmet.com]

I'm running OS X 10.3.9/Samba 3.0.10. When I try to connect to my 
Windows 2000 machine from my user account, I enter the correct 
workgroup/user/password and then get the message 'The Finder cannot 
complete the operation because some data in "smb://machinename" could 
not be read or written. (Error code -36).' (Error code -36 in OS X is 
"i/O error (bummers)".)

I can connect fine to the Windows machine with the same 
workgroup/user/password from another user account on the same OS X 
machine.

 From both user accounts, the Windows machine shows up when I run 
smbtree.

When attempting the connection, I get the following in console.log:
mount_smbfs: session setup phase failed: syserr = Permission denied
mount_smbfs: could not login to server MACHINENAME: syserr = Permission 
denied
mount_smbfs: session setup phase failed: syserr = Socket is not 
connected
mount_smbfs: could not login to server MACHINENAME: syserr = Socket is 
not connected

The first two lines show up in the log when the SMB/CIFS Filesystem 
Authentication window first pops up, before I've even typed anything. 
The second two lines show up after I click OK in the authentication 
dialog.

I used svn to get the source from the SAMBA_3_0_RELEASE branch, but 
couldn't find the string "session setup phase failed" in any of the 
files.

I'm not really sure where to go next in troubleshooting. I'd certainly 
appreciate any tips.