Some users are able to logon from an XP workstation but not from Win2k.
I don't think that's the root cause but after looking at the IIS logs,
I noticed that user credentials from the Win2k workstations are not
being passed on to IIS, although "Enable Integrated Windows
Authentication" is selected in IE. Is there something that can be done,
either on the client or server side, for IE to pass user credentials?

Below is a snippet of the log from IIS. The Unsuccessful logons aren't
passing user credentials.

## Unsuccessful Logon ##
2006-06-09 00:15:25 192.xxx.xxx.xxx GET /_vti_bin/owssvr.dll - 80 -
192.xxx.xxx.xxx 401 2 2148074254
2006-06-09 00:15:25 192.xxx.xxx.xxx GET /_vti_bin/owssvr.dll - 80 -
192.xxx.xxx.xxx 500 0 2148074242
2006-06-09 00:25:15 192.xxx.xxx.xxx GET /_vti_bin/owssvr.dll - 80 -
192.xxx.xxx.xxx 401 2 2148074254
2006-06-09 00:25:15 192.xxx.xxx.xxx GET /_vti_bin/owssvr.dll - 80 -
192.xxx.xxx.xxx 500 0 2148074242
===============================================================================
## Successful Logon ##
2006-06-09 00:26:13 192.xxx.xxx.xxx GET /_vti_bin/owssvr.dll - 80
DOMAIN\USERID 192.xxx.xxx.xxx 302 0 0
2006-06-09 00:26:13 192.xxx.xxx.xxx GET /IT/default.aspx - 80
DOMAIN\USERID 192.xxx.xxx.xxx 200 0 0