Local domain controller authentication problem

[snipesnab]

Our current setup:

1 Multiple site locations linked by 4 Mb connections - each site has a domain controller which is part of the same domain.
2 Windows 2000 server and XP desktops
3 Citrix server farm at our London site

At each site, when the computer is initially turned on and logged onto they should authenticate against their local domain controller.

However the user then needs to logon to a citrix desktop. The citrix farm is located at our london office. Two domain controllers are located at the london office in the same server room as the citrix farm. Say the user is located at the Manchester office, when they logon to their citrix desktop they are currently authenticated by the domain controller at the Manchester office when we want them to be authenticated by the local London domain controllers (remembering that the citrix farm is located in london office). Surely the citrix user should be authenticated at the london domain controller, but it is being authenticated by the manchester domain controller over the 4 MB link. Does anyone know why this is happening and how I can change it?

The site are all on the same subnet (class c) 255.255.255.0 but the ip address ranges are in the following scheme:
London : 172.16.10.x
Manchester 172.16.11.x
etc etc

Many thanks.

 

[MikeBatters]

Have you set up Sites & Associated Subnets in the AD?

If not this should solve your problem.