WinXP SP1 logging into NW4.2 tree

Good day all.
I have new workstations that are running the 483SP1 client logging into a tree with two servers. If I log in at location A I get connected to both servers fine. If I log in at location B the logon process hangs for about a minute and eventually comes up with a 1054 error – Server could not be found(this is the server at location A, location B server logs in fine). Both servers are running Netware 4.2. The DNS settings are correct. Last week I used the “reset router” command at location B and it cleared up the issue for about a week. This problem has returned over the weekend. The only major difference between the two servers is that location B has two NIC’s.

Any help would be greatly appreciated