Question : SBS 2003 - Cannot connect to Exchange on LAN

This problem has just started occurring.
I have lost connection to Exchange. Outlook 2007 will not connect either in MAPI or POP3 modes.

This has happened a couple of times recently, and eventually, after a number of restarts the connection has come back for a few hours.

This morning, no connection again.

I have re-run the IECW - no joy.
I have checked the Appplication and System event logs and nothing relevant appears to be there.
I have restarted the server - no joy.
I have checked other access to the server - it pings ok, I can connect via Remote Desktop etc.
I've done an IISRESET.

I'm at a loss to explain this particularly as there are no apparently relevant event log entries.

Help!!

Answer : SBS 2003 - Cannot connect to Exchange on LAN

The secondary should not be your ISO and this is more than likely what Is causing the problem.

When the clients are unable to lookup the SBS server it will revert to the secondary, it won't go back to the primary unless the DNS cache is manually flushed or the secondary becomes unavailable.

It's bad practice to have it configured this way and is more than likely causing your problem.  Especially as it's intermittent.

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