Fejl i event log

Jeg har nogle problemer med at slippe af med følgende fejl i min event log. Win2003 DC som replikerer med 3 andre servere.

Application: Process EMSMTA.EXE (PID=4864). The Domain Controller 4.test.local is running (Unknown Operating System) (Unknown Service Pack). DSAccess requires that  Domain Controllers that run Windows 2000 have at least Service Pack 3 installed.

OALGen skipped some entries in the offline address list '\Global Address List'.  To see which entries are affected, event logging for the OAL Generator must be set to at least medium.
- Default Offline Address List


Directory service:

Active Directory attempted to perform a remote procedure call (RPC) to the following server.  The call timed out and was cancelled.

Server:
d40e9427-4437-4fc7-8494-b64abb427449._msdcs.test.local
Call Timeout (Mins):
5
Thread ID:
834

Additional Data
Internal ID:
5000bf2

The attempt to establish a replication link for the following writable directory partition failed.

Directory partition:
DC=test,DC=local
Source domain controller:
CN=NTDS Settings,CN=SERVER5,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=nordbodom,DC=local
Source domain controller address:
d40e9427-4437-4fc7-8494-b64abb427449._msdcs.test.local
Intersite transport (if any):


The File Replication Service is having trouble enabling replication from SERVER4 to SERVER1 for c:\windows\sysvol\domain using the DNS name server4.test.local. FRS will keep retrying.
Following are some of the reasons you would see this warning.



Altså en del problemer. nogle af serverne står i den anden ende af en VPN tunnel, men det burde jo ikke være noget problem.

Håber i kan hjælpe mig! Har forsøgt med microsoft's hjælp, men uden positivt resultat.