If you find that when you open the MOM 2005 Operators console there are numerous heartbeat alerts present stating that the managed computers are unreachable or even that they are offline the issue may be a domain time synchronization issue. This is particularly true if the MOM server and the MOM One point SQL Database are on separate servers.
This may be due to the fact that the current system time setting on the MOM 2005 server is out of synchronization with the domain time or is out of synchronization with the MOM SQL Database.
In a Windows 2003 server domain the domain time is set and determined by the Windows 2003 primary server (As long as it is a PDC Enumerator) and it is the official time keeper for the domain. As far as your Windows XP or better workstations are concerned by default they synchronize their local system time with the Windows 2003 primary server or the domain automatically.
To correct these issues synchronize the time for the MOM server and the MOM database server with the domain. You can do so by running any of the following from with a command prompt window:
Net Time %LogonServer% /Set /y
Net Time \\PDC_Host_Name /Set /y
Net Time \\ PDC_Host_IP_Address /Set /y
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