SSH Tunnel Questions

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Basically, I am wanting to use my home linux server as a ssh tunnel / proxy. So that I can access services from the server.

I want to be able to use samba port 193 from another machine
Cups would also be an added bonus later on down the road.

I have already configured firefox to work on a windows machine on a seperate network using this ssh forwarding.

I use plink -D 12345 username@host and set up my socks proxy in firefox
Few Questions on firefox side though. How are dynamic ports different from regular local ports? and why does this only work as a socks proxy? I get a white screen if i attempt it as regular http proxy using localhost port 12345. I'm guessing its because its not the right protocol.