shell ssh over a ssh tunnel

hello

i have a ssh tunnel available between internet/intranet network. but i can not login the gateway. only forward is available.
how can i open a shell on a sshd server inside intranet throw the ssh gateway.

ssh -N -L 22:sshd_intranet:22 sshd_gateway
it do not work, ssh localhost returns:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is

thanks
.

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