wan & login issues ?

Running 6 Netware 4.2 servers, Windows Xp/Nwclient 4.9 SP2 and a few
Windows NT4/Nwclient 4.30/ Zen 1.1 Starter pack. We use Workstation
Manager and DLU. Users launch Naldesk on Windows XP and Nalexpld on
Windows nt4. Both are called from the login script and launched from the
server. We have one ROOT partition, and all the servers have a RW replica
of this partition. Although not an ideal design, this all has worked
flawlessly for years.

This weekend we moved part of our network to another building and
therefore now have a WAN IPX environment. We don't have any users at the
new location yet. Some users at our original location are now having login
issues - they get the " red N" icon like its trying to login but nothing
ever happens - there's no error message and they don't get logged in. I
let one user/workstation stay like this overnight and still nothing!

Where can I look to troubleshoot this? I can't find any error logs and
can't find any consistencies between the incidences & resolutions. It
seems a number of reboots / or reselecting the Tree/ Context / Sever in
the Advanced tab SOMETIMES helps. I saw a tid / post about settings in the
client if you are running Zen across a wan...do I need to do this (bad
address cache, server name cache, etc) We aren't really running Zen across
the wan though - users load nal/nalexpld from the server in their
location, not a server across the wan.

I know IPX across a wan is not good, but we are only running NW 4.2 so we
don't have a choice. I have the client properties set up to default to the
server in the user's location rather than across the wan, and to load NAL
from a server in their location rather than across the wan.

Thanks