You use SSH every day. But did you ever wonder how it came to be attributed port 22? Here's the story, straight from the horse's... well... Tatu Ylonen's mouth: https://www.ssh.com/ssh/port
And if after reading that you're wondering why FTP had 21 and Telnet 23 (leaving 22 free), you should go back to the NCP protocol that preceded TCP: http://www.pcvr.nl/tcpip/introduc.htm
@citizenk I use ssh every day, but ssh requires roundtrips to echo characters, sftp has quoting bugs that the devs refuse to fix, and compiling software over sshfs is so slow as to be effectively impossible
it's time to fix our shit, not lionize historical mistakes like port numbers