Outlook request data from GC

[supergod]

Here's the situation...
My company have 2 subnets, say subnet A and B.
The internal routing is done by the firewall, therefore both outbound connection to internet or inbound connection across subnets must pass through the firewall(Running CheckPoint VPN-1 on Solaris).

The Exchange server and other DC/GC sits on Subnet A.
The Exchange server(SKMAIL) itself is a DC, hosting the DNS. It is not set as a GC.
Other 2 servers act as DC and GC, namely FILEP and TEMP.
TEMP is the DC which have the 5 FSMO roles.

When the client(using Outlook 2000/XP) is also on the same subnet(ie. Subnet A) with the mail server, everything goes fine.

But when the client is on the other subnet(ie. Subnet B), occasionally errors occured. When I click "New mail" or when I press the "Send" button, sometimes a dialog box would pop up saying that it is requesting data from exchange server FILEP and TEMP, which both are DC and act as GC(Global Catalog). The fact is it never request data from the real Exchange server(SKMAIL) itself, but just the other two DC/GC.

I wonder why would this happen. Is this a DNS problem? Or it's the firewall settings? Please comment on this. Thank you.

 

[BenNyeTheITGuy]

Did you ever find a soultion to this issue,
My company has the same problem...................
plus a lot of in-fighting between the PC Supp, NT, Data groups to point the finger at who is responsible for the fix................

TIA,

BN