What's your OS & Outlook version? I have users running WinXP & Outlook2002, and they are getting similar errors during the day whenever their laptop comes back from sleep mode. Are your computers maybe going to sleep instead of shutting down at night?
When they come back from sleep, they...
Limiting Exchange to IP only with the client reghack notably helps our situation, but then it's true you need to resolve the server name on an IP level. If you can ping the server and it resolves to the name alone all caps, you could be relying on WINS and NBT. If it resolves to name with...
No, NO! It's on the Client, either Outlook or Exchange. It is actually used by (I think) the MAPISP32.EXE process. I believe I tried changing it and/or a corresponding server-seeming value on the Server, with either no or bad results. This is strictly a client setting, which means...
Have you tried limiting the Outlook client protocols to TCP only? Try this reg file:
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Exchange Provider]
"Rpc_Binding_Order"="ncacn_ip_tcp"
The default value uses RPC first, and also includes spx, named pipes...
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