ssh key setup and port-forwarding

i have linux running on A, B and C.


here i did a ssh key-setup between B and C ( generated rsa key and copyied it authorized_keys in C).
then did a port-forwarding on B ( ssh -4 -g -N -L2222:C:22 cuser@C ).

now when i try to ssh from A to C like 'ssh -p2222 cuser@B' , it asks for password.
i was expecting it to login to C without asking for password.
how to make ssh not ask for password?

any help is highly appreciated.


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