Remote Shell

I need to give remote shell access to a user in a server (an HP-9000 k410 running HP-UX 10.10) conected to mine through a 3Com router, I have done some investigation and what I have found is that I have to open port 514 for tcp, for some reason this did not work, so I opened (temporarily of course) all the ports on the router....and it worked, but I don´t want to leave it like that, Does anyone now what port(s) I need to leave open to alow the remote shells?. Is there any configuration needed other than the equiv.hosts and (or) the .rhosts files ? Thanks in advance for your answers Benicio Sanchez Network Operations Engineer Alestra