The number should preferably be in the range 1-255 so that it can be used in the WKS field in name servers. The software freely on the Internet and to get it into as wide use as possible. In particular, it prevents IP, DNS and routing spoofing. It provides major improvements in security and functionality over existing telnet and rlogin protocolsĪnd implementations. Organization: Helsinki University of Technology, Finlandĭear Sir, I have written a program to securely log from one machine into another over an insecure network. To me Jon felt outright scary, having authored all the main Internet RFCs!Īnyway, just before announcing ssh-1.0 in July 1995, I sent this e-mail to IANA: From ylo Mon Jul 10 11:45:48 +0300 1995 From: Tatu Ylonen Among other things, Jon had been the editor of such minor protocol standards as IP (RFC 791), ICMP (RFC 792), and TCP (RFC 793). At the time, that meant an esteemed Internet pioneer called Jon Postel and Joyce K. Port numbers were allocated by IANA (Internet Assigned Numbers Authority). Internet was smaller and we were in the very early stages of the Internet boom. The basic process for port allocation was fairly simple at that time. But how could I get that port number? I had never allocated one, but I knew somebody who had allocated a port. I figured having that port number might be one of those small things that would give some aura of credibility. It was conveniently between the ports for telnet and ftp. It was a time when telnet and FTP were widely used.Īnyway, I designed SSH to replace both telnet (port 23) and ftp (port 21). I wrote the initial version of SSH (Secure Shell) in Spring 1995. When I ( Tatu Ylonen first published this story in April 2017, it went viral and got about 120,000 readers in three days. Contents How SSH port became 22 The story of getting SSH port 22 Changing the SSH port in the server Specifying SSH port number on the command line Configuring SSH access through firewalls Outbound SSH Back-tunneling is a risk Inbound SSH access Enabling SSH access via iptables How SSH port became 22
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