[ASK] How to setup portfw to server behind another server

Hi Experts,

I was trying to find some documentations about this but seems I'm not good enough to find that one, so I'm seeking a help from the expert here.

I have 3 Solaris Server and the diagram as follow:

My PC => [Server A]----------[Server B]------------[Server C]

I was able to setup port forwarding to Server B through Server A and it works well.

how can I setup port forwarding through Server C? Server C only accessible by Server B, Server A cannot access it.

thanks a bun in advance if you have any workaround to get this.

Thanks
BR// AdziE