Back in my dark horse days, I telnetted into Compaqs alpha devision, and was greeted with the message "RC5 and Seti@Home are stricly forbidden on these systems..." So I would not recommend running RC5 over a telnet anywhere, even if you have permission on that system. People may start to get suspicious.
strates
p.s: I knew the guy that had access to the alpha division, he let me in, and then changed his password.