login-lgnwnt32.dll-923: An unexpected error has occurred: 15 (8819)

This is partway thru login script processing after successful 802.1x
authentication. I've seen at least one or two posts similar to this from
4.91sp4 beta. We are running the final release of 4.91sp4. Machines have
integrated Intel ProSet wireless.

Have tried all sorts of things... disabled DHCP for SLP and SLP Active
Discovery and hardcoded SLPDA's and scopes... entered server IP address at
initial Novell login.

I'm looking for other ideas here, any suggestions?

Thank you,