All, I'm running a windows 2003 native domain with exchange 2003 in 3 different sites. About once a week mail in my local site seems to get stuck and fills up the mail queue destined for my other 2 exchange servers in my forest. I've tried all the basic trouble shooting steps including telnet to port 25 on each server. I do still receive mail internally and can send and receive external when this happens, I just can't send to my exchange servers in the other sites. So I thought it might be a lookup problem in DNS or replication error so I ran dcdiag against my local DC and this is what I get: Testing server: Redmond\Servername Starting test: Replications ......................... Servername passed test Replications Starting test: NCSecDesc ......................... Servername passed test NCSecDesc Starting test: NetLogons ......................... Servername passed test NetLogons Starting test: Advertising ......................... Servername passed test Advertising Starting test: KnowsOfRoleHolders [ Remote Servername] DsBindWithSpnEx() failed with error 1753, There are no more endpoints available from the endpoint mapper.. Warning: Remote Servername is the Schema Owner, but is not responding to DS RPC Bind. [Remote Servername] LDAP search failed with error 58, The specified server cannot perform the requested operation.. Warning: Remote Servername is the Schema Owner, but is not responding to LDAP Bind. Warning: Remote Servername is the Domain Owner, but is not responding to DS RPC Bind. Warning: Remote Servername is the Domain Owner, but is not responding to LDAP Bind. Warning: Remote Servername is the PDC Owner, but is not responding to DS RPC Bind. Warning: Remote Servername is the PDC Owner, but is not responding to LDAP Bind. Warning: Remote Servername is the Rid Owner, but is not responding to DS RPC Bind. Warning: Remote Servername is the Rid Owner, but is not responding to LDAP Bind. Warning: Remote Servername is the Infrastructure Update Owner, but is not responding to DS RPC Bind. Warning: Remote Servername is the Infrastructure Update Owner, but is not responding to LDAP Bind. ......................... Servername failed test KnowsOfRoleHolders Starting test: RidManager ......................... Remote Servername failed test RidManager Do you I need to configure my local Exchange server to use LDAP? If so how? Could this be a permissions problem? Thanks in advance Mike