connecting a Win2000 pc to a linux cluster

I have installed a linux cluster connected with M2M-PCI64A interfaces and a M2M-DUAL-SW8 switch (cluster works fine).
Now i try to connect a single Win2000 PC to the cluster (same hardware as the cluster nodes).
During the installation procedure (gm-1.4-new-features, passive mapper) i don't get any problems.
The "gm_board_info" command lists all the nodes of the cluster and also the new Win2000 node.
on the linux side, the "gm_board_info" command doesn't list the new Win2000 node.
A "ping" from windows to linux or vice versa doesn't work.
Has anyone an idea what's going wrong?
 
Thank you

Ralf Kuehn