SSH tunnel with PuTTY

Imagine, you can SSH to a host / server and use this SSH server as a proxy to access any local webserver (or anything else) on the local network of the SSH server… This is easily possible with PuTTY (awesome SSH client!).
As a demo, lets say we have the following topology:
PuttySSHTunnel
We would like to manage the local firewall (192.168.1.254) from a pc on the internet. We assume   that we can SSH into the SSH server.
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