Need help trouble shooting static nat

Bordermanager 3.7 sp3, Netware 5.1 sp8
GWIA server Netware 6.5 sp7

we have 8 static nat addresses set up and they have all been working
fine for years, then one of them stopped working (our GWIA) I can not
figure out how to get it working. All the rest of the static nat
addresses are working fine.

I have tried:
rebooting border server and mail server
deleting the static NAT reinitializing adding it back in
changing NIC cards on the GWIA server
unloaded filters

What am I missing?

Thanks