rsh

I use linux7.2. I have installed the rsh0.17-2.5 and I have changed the hosts.equiv , .rhosts and hosts. But others cannot connect with me, but I can rsh to others, what's more, I cannot rsh to myself! I donnot know why. Would you so kind that give me so ideas? One another important thing is that when I type "rsh hostname", it only tell me that hostname(my own computer) is refused ot connect.