Here's the situation. We have a network with two subnets and one tree.

Server1 is running;

Netware 6.5 sp5
has all master replicas

Server2 is for an isolated lab:

has netware 6.5 sp6
BorderManager 3.8 sp5
ndps etc.
two nics

In server 2 one nic is configured for the lab at 192.168.2.x and the other
is configured the same as the rest of the tree eg. 192.168.1.x. Filters are
configured on this server to drop any packets going from the 2.x network to
the 1.x network. However, the lab is configured for the 2.x network and
users need to be able to authenticate to the nds tree. This server has no
replicas on it. This setup was working fine until we replaced the
workstations in our lab. Now these new workstations are no longer able to
authenticate to the tree. Does anybody have any idea what the cause could
be? Nothing has been changed on the servers recently.