How does authentication work?

When a device attempts to connect to a shared drive on another server it is
the remote server that requests the credentials to authenticate the
connection right?
What determines how long the connection can remain before the remote server
requests authentication again?

We have a Win 2003 server that maps drives to SAN sharespace through another
Win 2003 server.
The drive mappings are made using a different set of credentials than the
current logged on account.
Win 2003 server after SP1 no longer caches credentials for connections using
a different account than the logon account.

When we boot our server the mappings are established but the drives do not
connect until you click on one of them in Windows Explorer which pops up an
ID/Password prompt (because it will not store the credentials). Once the
credentials are entered the connection works. If the connection is unused
for 15 minutes the remote server auto-disconnects the connection as it
should but when the connection is accessed again it is re-established. This
works as expected but in something less than 48 hours the connection dies
and clicking on the drive in Explorer pulls back an error. The mappings
have to be deleted and re-added which forces a new authentication prompt and
then the connection works again.

I believe that when the remote server receives valid authentication
credentials that it sets the connection to be allowed from that remote
device for a specified time after which it requires re-authentication which
our server cannot provide because it does not cache credentials for
connections using a different logon id/password.

What could be governing the time the connection can remain before needing
re-authentication?
Our Network Engineering team just shrug their shoulders and say it is not on
their end.


.

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