WindowsServer 2003Error

I created a Security Group for may domain and everytime i press on "members" tab i get: "a local error has ocurred" and if i press on "member of" tab i get: "The Following Active Directory error ocurred: The local security authority cannot be contacted".
If i do this from another domain i have, the problem doesnt happend, it's only on this network/domain. can someone help me with this.