Win2003 Server domain connections increadibly slow...

I have an issue where any of several boxes on a Win2003 server domain (SP2
on the domain server) have several connection issues with each other.

1. Despite being able to see the domain server well enough to log into the
domain, any connection to a different system on the network requires
authentication into that local box using a login local to that box (even if
logged into the domain as a domain admin, and the domain admin is a
administrator on all domain boxes).
2. Prior to the demand for local log in, the explorer process that you
navigated to the remote box with will hang for several minutes prior to
showing the authentication dialog.
3. Even after authenticated, any file resolutions (for example, navigating
to a file in explorer) will take as long as a full minute or more to resolve
to the file. For example, I navigate to a new directory, that takes a while.
Now, I select a new file in that directory (a file already showing in the
explorer window), and that takes a while.
4. If a copy is initiated between boxes on the network, the copy will happen
at an unbelievably slow rate, and will often time out as a "file
unavailable" error.

Some facts on the network:
Server is Win2003 SP2 with most security patches since SP2's release.
The domain install is pretty much the 2003 domain default installation
The network is 100Mb network
All boxes are behind the firewall
Connections outside the network (to the internet) happen at normal speeds
Windows Firewall is *not* enabled on any box in the domain
As near as I can tell, all boxes in the network are affected no matter what
box they are conntecting two.

Any idea what is at issue here? I have occassionally seen issues on other
networks where the remote box seems to partially lose resolution
authenticating on the network other than initial login, but I've never seen
the speed issues before.

TIA


.

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