Problem Connecting to Global Catalog (Event 1126)

[pete8]

I recently replaced our school Windows 2000 domain with new 2003 domain + new servers about a month ago.

The domain model is like this: -

Parent Domain Controllers:
SVR-A (Win2003, new server build)
SVR-B (Win2000, old server, Global Catalog)

Child Domain Controllers:
SVR-C (Win2003, new server build)
SVR-D (Win2003, new server build)

FSMO roles have been configured across three servers.

Everything was fine until 2 weeks ago. I noticed all three SVR-A, C and D error Event 1126 - unable to locate Global Catalog.

I've also noticed Event 8003 on all servers regarding problem locating the Master Browser.

I've checked recommendations at EventId.Net & TechNet ..

- DNS SRV record is correct
- Global Catalog is configured in AD Site & Service
- The servers are communicating according to NTDS
- All 3 servers are configured to sync clock with a server
- FSMO seems to be fine
- FYI: There's no Exchange server
- Svr-B will be upgraded to W2003 soon

I appreciate any advice anyone can share. Maybe I missed something. Thanks