Exchange 2007 SP3, Windows Server 2008 Not sure what caused it but our OA has decided to take a holiday. On MS connectivity analyzer it fails on, "Attempting to ping RPC endpoint 6004 (NSPI Proxy Interface)". I can telnet to 6001, 6002, and 6004 just fine locally. Tried disabling and re-enabling and rebooting the server. Any help would be appreciated. Edit - When I use RPCping externally I get the following results... Port 6001 RPCPing v2.12. Copyright (C) Microsoft Corporation, 2002 OS Version is: 6.1, Service Pack 1 Completed 1 calls in 7344 ms 0 T/S or 7344.000 ms/T Port 6002 RPCPing v2.12. Copyright (C) Microsoft Corporation, 2002 OS Version is: 6.1, Service Pack 1 Completed 1 calls in 2469 ms 0 T/S or 2469.000 ms/T Port 6004 RPCPing v2.12. Copyright (C) Microsoft Corporation, 2002 OS Version is: 6.1, Service Pack 1 Exception 1722 (0x000006BA) Number of records is: 2 ProcessID is 3524 System Time is: 4/8/2012 17:12:46:989 Generating component is 14 Status is -1073606647 Detection location is 1398 Flags is 0 NumberOfParameters is 2 Long val: 4 Long val: -1073606647 ProcessID is 3524 System Time is: 4/8/2012 17:12:46:988 Generating component is 13 Status is -1073606647 Detection location is 1401 Flags is 0 NumberOfParameters is 0 C:\Program Files (x86)\Windows Resource Kits\Tools>

Hello, [Check the 6004 port settings in registry] ============================== HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters Value name: HTTP Port Value type: REG_DWORD Value data: 0x1772 (Decimal 6002) HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters Value name: Rpc/HTTP NSPI Port Value type: REG_DWORD Value data: 0x1774 (Decimal 6004) [Check NSPI interface protocol sequences] ============================== HKLM\System\CurrentControlSet\Services\NTDS\Parameters Type: REG_MULTI_SZ Name: NSPI interface protocol sequences Value: ncacn_http:6004 If it still does not work, please use the following commands to check if other applications are listening on the 6004 port. Netstat ano Tasklist Thanks, Simon Wu Exchange Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

Hello, Is there any update on this thread? Thanks, Simon Wu Exchange Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

Simon, thanks for your reply - sorry I was away. I have the first two keys but I did not find the 'NSPI interface protocol sequences'.Should I just add that in and test? ...do I need to reboot?