How to hack the web interface of a router knowing the open port 9559 on it?

Question

FreeBSD

There is a router, I know its white IP.
With my FreeBSD 10.2, I scanned all the ports on this router with nmap, one turned out to be open, unfiltered. Just Open. Port 9559. However, what kind of service hangs on it is unclear. What can be done knowing the open port? I'm not savvy in hacking, please tell me where to dig. You need to get into the web interface of the router. Either handles through the bash into his fireworks to climb and forward the necessary ports there.
Sincerely.
UPD. Found out that this is an RDP port. Cool. I'm trying to break the remote, purely sporting interest. :)

Answer 1

Reset the router to default settings and set it up again as you need.