Ping AS/400

I am having trouble establishing a tcp/ip connection with our AS/400.

We have a token ring network with one ethernet segment. The ethernet segment is connected to the rest of the network with a multi-homed NT server as a router. To reach the AS/400, a computer on the ethernet segment must go thru the router and 2 IBM 8229 token ring bridges. While I can ping other computers on the same token ring ring as the AS400 from my ethernet segment, I cannot ping or connect to the AS400 from the ethernet segment.

Any suggestions will be greatly appreciated.