We have a Windows Server 2008 member server in a 2003 domain with 2 domain controllers. It holds our Exchange 2007 server and some other data. For the last two weeks, off and on, we have had a problem logging into Exchange from the outside. The problem will appear, and then go away. The last time this happened, I ran DCDIAG from the 2008 server, and it produced a number of errors. Interestingly enough, while the login capability came back, the errors remain, so the problem probably lies elsewhere, just waiting to be tracked down. In the meanwhile, I would like to know if there is something that should be done to extend the 2003 Active Directory to accommodate a 2008 server. Below are the errors I see when running DCDIAG on the 2008 server. Running on the other two servers, which are domain controllers, shows no errors. Directory Server Diagnosis Performing initial setup: * Identified AD Forest. Done gathering initial info. Doing initial required tests Testing server: Default-First-Site-Name[server] Starting test: Connectivity ......................... [server] passed test Connectivity Doing primary tests Testing server: Default-First-Site-Name[server] Starting test: Advertising Fatal Error:DsGetDcName ([server]) call failed, error 1722 The Locator could not find the server. ......................... [server] failed test Advertising Starting test: FrsEvent [[server]] An net use or LsaPolicy operation failed with error 53, The network path was not found.. ......................... [server] failed test FrsEvent Starting test: DFSREvent ......................... [server] failed test DFSREvent Starting test: SysVolCheck ......................... [server] failed test SysVolCheck Starting test: KccEvent ......................... [server] failed test KccEvent Starting test: KnowsOfRoleHolders ......................... [server] passed test KnowsOfRoleHolders Starting test: MachineAccount Could not open pipe with [[server]]:failed with 53: The network path was not found. Could not get NetBIOSDomainName Failed can not test for HOST SPN Failed can not test for HOST SPN ......................... [server] passed test MachineAccount Starting test: NCSecDesc ......................... [server] passed test NCSecDesc Starting test: NetLogons [[server]] An net use or LsaPolicy operation failed with error 53, The network path was not found.. ......................... [server] failed test NetLogons Starting test: ObjectsReplicated ......................... [server] passed test ObjectsReplicated Starting test: Replications ......................... [server] passed test Replications Starting test: RidManager ......................... [server] passed test RidManager Starting test: Services Could not open Remote ipc to [[server].MyDomainName.com]: error 0x35 "The network path was not found." ......................... [server] failed test Services Starting test: SystemLog ......................... [server] failed test SystemLog Starting test: VerifyReferences ......................... [server] passed test VerifyReferences Running partition tests on : DomainDnsZones Starting test: CheckSDRefDom ......................... DomainDnsZones passed test CheckSDRefDom Starting test: CrossRefValidation ......................... DomainDnsZones passed test CrossRefValidation Running partition tests on : ForestDnsZones Starting test: CheckSDRefDom ......................... ForestDnsZones passed test CheckSDRefDom Starting test: CrossRefValidation ......................... ForestDnsZones passed test CrossRefValidation Running enterprise tests on : MyDomainName.com Starting test: LocatorCheck Warning: DcGetDcName(GC_SERVER_REQUIRED) call failed, error 1722 A Global Catalog Server could not be located - All GC's are down. Warning: DcGetDcName(PDC_REQUIRED) call failed, error 1722 A Primary Domain Controller could not be located. The server holding the PDC role is down. Warning: DcGetDcName(TIME_SERVER) call failed, error 1722 A Time Server could not be located. The server holding the PDC role is down. Warning: DcGetDcName(GOOD_TIME_SERVER_PREFERRED) call failed, error 1722 A Good Time Server could not be located. Warning: DcGetDcName(KDC_REQUIRED) call failed, error 1722 A KDC could not be located - All the KDCs are down. ......................... MyDomainName.com failed test LocatorCheck Starting test: Intersite ......................... MyDomainName.com passed test Intersite I have searched for a resolution, but none I found seems to fit. It was suggested by a few posts that the fault may live in sites and services, but, it appears that ll is well there.[/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server][/server]