The problem may be SMB signing or LAN Manager authentication level. In
Windows 2003, default server policy forces all SMB traffic to be digitally
signed which seems to cause a problem in some configurations of XP Pro. In
Local Security Policy (Start > Run > secpol.msc > OK) navigate to security
options (Security settings > Local policies > Security) and try disabling
the option for Microsoft network server:digitally sign
communications(always). Ensure you do this on all machines involved (such
as via a GPO for an OU). Run gpupdate /force on the server after making the
change and do the same on the client machine afterwards.
Security settings that can cause a problem with downlevel client access:
http://support.microsoft.com/default...5BLN%5D;811497
http://support.microsoft.com/default...b;en-us;823659
See also:
Slow SMB performance when you copy files from Windows XP to a Windows 2000
domain controller:
http://support.microsoft.com/?id=321169
Another possibility involving slowness between XP and Windows Server 2003
computers:
New registry entry for controlling the TCP Acknowledgment (ACK) behavior in
Windows XP and in Windows Server 2003:
http://support.microsoft.com/default.aspx?kbid=328890
--
Todd J Heron, MCSE
Windows Server 2003/2000/NT