SSH problems (from the beginning)

I have 2 machines, one with CentOs4.3 (A) the other with WhiteBox 4(B).
The machine A have a new installtion, the machine B has an already exists installation.
The machine A has the installytion as is (except tah i choose an IP adress for eth0) 200.118.115.241 from the graphical interface on Hosts Label
The machine B has eth0 and eth1, it works as proxy
i can connect by ssh from A to B
i can ping B from A
i can not connect by ssh from B to A
i can`t ping  A from B
if i do NSLOOKUP in A the reponse is Server inexistent

What im doing bad?

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