How to make telnet work for both localhost and 127.0.0.1

I’m having some troubles (in fact I'm struggling really bad with it) on using telnet locally on my PC. I’ve already enabled the service and made it work for some local ports. The weird thing is that I’m able to connect when I use: telnet localhost #PortNumber where #PortNumber is 135, for example. But when I use : telnet 127.0.0.1 #PortNumber with the same #PortNumber (in this case...