Re: Network Applications Open Very Slow

Tech Tip: Click here to run a free scan for Windows Errors and optimize PC performance

From: Todd J Heron (todd_heron_no_spam_at_hotmail.com)
Date: 12/16/04 

Date: Wed, 15 Dec 2004 22:53:19 -0500

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.aspx?scid=kb;%5BLN%5D;811497
http://support.microsoft.com/default.aspx?scid=kb;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

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