Question : Problem: WatchGuard 1250x with Active Directory Single Sign-on to Windows 2000 domain

I have a WG 1250x firewall configured for Single Sign On to a Windows 2000 domain controller and its backup (both have the SSO agent installed).
I have a group on the WG and Active Directory called Internet Users that is set up in Policy to access HTTP to the Internet.
I log on a workstation as a user in that group and attempt to access a HTTP website.  I never see the user show up in the Firebox System Manager / Authentication screen.  That screen remains blank.
We even installed the SSO client on the workstation.  Still, the user was not authenticated to the domain on the WatchGuard.  I would appreciate any help on this issue!  Thanks!

Answer : Problem: WatchGuard 1250x with Active Directory Single Sign-on to Windows 2000 domain

Sorry but I am not sure why it is not working; may be SSO does not work with win2000.