Thank you for the replies of you and Rick. I failed in viewing available resources on C both from Explorer on A (or using NET VIEW \\IpAddress). In all locations I logged in using the same account that exists in all servers using the same password. No trusting relations were set up among servers.

The things strange are
1. There should not be problem server C because it can be connected from office B.
2. There should not be problem with the computer of office A because it can connect to server B.

If both server C and the computer of office A are normal, why can't the computer of office A connect to server C?

TIA
Ben


>>1. We have 3 offices A, B & C. In office A, I can successfully map a network drive connecting to the server in office B, but fail in mapping a drive to the server in office C. (I can ping the server without problem) However, in office B, there is no problem mapping drives to the servers in both office A & C. What may cause the problem?
>>
>
>It may be a routing issue or a protocol blocking issue. Can you view the availble resources on C from Explorer on A? Are you authenticated on Server C with the user from A?