Block Telnet connection by iptables
 

Hello! I want to block Telnet connection with given port but I want to still use this service. For example I have SSH server and when I do "telnet localhost 22" after connection the server displays some information. I want to block it but of course I still want to use SSH. Have some ideas?

In a nutshell no. As far as I know it isn't possible to determine whether the TCP connection is coming from telnet or a client. In the case of ssh the only way to change the information displayed is to edit the source code and recompile.