I think you mean the telnet client, not the server. The telnet client is ok.
Yeh, I messed up
I mean the fackt that when I use a machine on the internet with a telnet client, and write "telnet myip 80" I get output on my webserver version "apache 2.0.54 (fedora)"
Same with main en other stuff.
Doesn`t these kind of feedbacks give hackers an advantage in knowing versions an system.