>There are a number of reasons why this could be the case. The most obvious is if multiple network cards are used to segment the network. Going from A to B, you could be going one way through the network, traversing a different set of network nodes. Each of those nodes is confgiured with the correct protocols. Going from B to C, the same could be true. However, going from A to C could introduce an entirely different route.
>
>Have you tried the other way: going from C to A. If it is an authentication issue, this direction may work. If it is a protocol/routing issue, then this should fail as well.

Larry,

From C to A is not OK. From the information available, what will you suggest me to do?

TIA
Ben