I am running SBS2011 fully patched, and have the following error in my event log: Unable to register the MSExchangeAB RPC interface. Failed with the error code The endpoint is a duplicate (1740) Exchange Address book is not running. The following process are on the following ports: TCP 0.0.0.0:6001 0.0.0.0:0 LISTENING 7056 Microsoft.Exchange.RpcCli 7056 MSExchangeRPC TCP 0.0.0.0:6002 0.0.0.0:0 LISTENING 4148 spnsrvnt.exe 4148 SentinelProtectionServer TCP 0.0.0.0:6004 0.0.0.0:0 LISTENING 568 lsass.exe 568 kdc, Netlogon, NTDS, SamSs Any ideas how i can resolve this? Thanks in advance

Hi, It seems the port is listened by other process. You can use the tasklist to see the process. Thanks, Simon

Hi, It seems the port is listened by other process. You can use the tasklist to see the process. Thanks, Simon