Citrix ICA Connected Client File Access on a Client-Mapped Drive is Slow the First Time

• Microsoft Windows NT Server versions 4.0, 4.0 SP4, Terminal Server Edition

SYMPTOMS

When a Citrix ICA-connected client gains access to a file on a client-mapped drive for the first time, the access time may be very slow. Subsequent usage of that client-mapped drive behaves as expected.

CAUSE

This problem occurs because the Citrix ICA client-mapped drive is not listed in MupPrefixTable when the connection to the file is made. Therefore, Mup.sys tries to reconcile this by searching for the specified server first through the Pkt table, and then through the network devices. This process can be slow in some configurations.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows NT Server 4.0, Terminal Server Edition service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

   Date       Time      Version   Size    File name  Platform
   -----------------------------------------------------------
   04/02/99   04:19pm   4.00      68816   Mup.sys    x86 

STATUS

Microsoft has confirmed this to be a problem in Windows NT Server 4.0, Terminal Server Edition.

Additional query words:

Keywords :
Version : winnt:4.0,4.0 SP4
Platform : winnt
Issue type : kbbug