This site, is devoted to the extreme computer security needed in todays world of cybercrime. Many of us think we are secure and most of us are not. Please email ideas or tips to admin@computersecurity.cc.
Telnet
Use telnet to try and connect to suspect ports.
Telnet is insecure as a service so don’t use it for that. Instead, replace it with a program like SSH. Make sure and have encrypted logon sessions.