Windows SBS 2003 probleme mit DC

HI,

ich erhalte seit heute immer die Fehelermeldung

Quelle: Userenv Ereignis:1054

Der Domänencontrollername für das Computernetzwerk konnte nicht ermittelt werden. (Unerwarteter Netzwerkfehler. ). Die Verarbeitung der Gruppenrichtlinie wurde abgebrochen.

Jetzt habe ich mal nslookup mit der IP des Servers ausgeführt

C:\>nslookup 192.168.178.100
Server:  salserver.salgmbh.local
Address:  192.168.178.100

Name:    salserver.salgmbh.local
Address:  192.168.178.100

Habe dann dcdiag laufen lassen.

Domain Controller Diagnosis

Performing initial setup:
   Done gathering initial info.

Doing initial required tests
   
   Testing server: Standardname-des-ersten-Standorts\SALSERVER
      Starting test: Connectivity
         ......................... SALSERVER passed test Connectivity

Doing primary tests
   
   Testing server: Standardname-des-ersten-Standorts\SALSERVER
      Starting test: Replications
         ......................... SALSERVER passed test Replications
      Starting test: NCSecDesc
         ......................... SALSERVER passed test NCSecDesc
      Starting test: NetLogons
         ......................... SALSERVER passed test NetLogons
      Starting test: Advertising
         ......................... SALSERVER passed test Advertising
      Starting test: KnowsOfRoleHolders
         ......................... SALSERVER passed test KnowsOfRoleHolders
      Starting test: RidManager
         ......................... SALSERVER passed test RidManager
      Starting test: MachineAccount
         ......................... SALSERVER passed test MachineAccount
      Starting test: Services
            IsmServ Service is stopped on [SALSERVER]
         ......................... SALSERVER failed test Services
      Starting test: ObjectsReplicated
         ......................... SALSERVER passed test ObjectsReplicated
      Starting test: frssysvol
         ......................... SALSERVER passed test frssysvol
      Starting test: frsevent
         ......................... SALSERVER passed test frsevent
      Starting test: kccevent
         ......................... SALSERVER passed test kccevent
      Starting test: systemlog
         An Error Event occured.  EventID: 0xC25A001D
            Time Generated: 07/21/2009   14:24:57
            (Event String could not be retrieved)
         ......................... SALSERVER failed test systemlog
      Starting test: VerifyReferences
         ......................... SALSERVER passed test VerifyReferences
   
   Running partition tests on : ForestDnsZones
      Starting test: CrossRefValidation
         ......................... ForestDnsZones passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... ForestDnsZones passed test CheckSDRefDom
   
   Running partition tests on : DomainDnsZones
      Starting test: CrossRefValidation
         ......................... DomainDnsZones passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... DomainDnsZones passed test CheckSDRefDom
   
   Running partition tests on : Schema
      Starting test: CrossRefValidation
         ......................... Schema passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... Schema passed test CheckSDRefDom
   
   Running partition tests on : Configuration
      Starting test: CrossRefValidation
         ......................... Configuration passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... Configuration passed test CheckSDRefDom
   
   Running partition tests on : SALGmbH
      Starting test: CrossRefValidation
         ......................... SALGmbH passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... SALGmbH passed test CheckSDRefDom
   
   Running enterprise tests on : SALGmbH.local
      Starting test: Intersite
         ......................... SALGmbH.local passed test Intersite
      Starting test: FsmoCheck
         ......................... SALGmbH.local passed test FsmoCheck

Komme aber mit den Fehlermeldungen nicht so ganz klar. Kann mir jemand bei der Lösung helfen?

Danke euch schon mal.