I want to access my Linux server(vnc) from a distant machine which has most ports blocked with the exception of 21, 25, 80, 135, and 445.

So, I would like to know if theres a way to communicate with my vnc server on the server, while using an available port on client.

i.e. port 25

So I think essentially I need the serverside router to forward packets coming in on port 25 to linux server machine(servername, p5900), which should forward them on to itself on port 5900.

And when transmitting, I need the server OR to router to send out packets changing their port to 25.

Im totally lost on how to acheive this. Please help(much appreciated). Thanks

I do not use smtp.