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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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The (short) story of how the SSH port became 22. (www.ssh.com)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

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cross-posted from: https://programming.dev/post/9907720

The SSH port is 22. This is the story of how it got that port number. And practical configuration instructions.

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[–] [email protected] 27 points 7 months ago (2 children)

It was a company almost from the start. In the mid 90s Tatu Ylonen created ssh v1 and released it as freeware, then shortly afterwards apparently he regretted it and created ssh v2, made it proprietary and commercialized it with his company.

In the late 90s some OpenBSD guys then forked the unencumbered ssh v1 source to create OpenSSH and implemented ssh v2 with it and their ssh version eventually gained traction and became dominant.

[–] [email protected] 4 points 7 months ago (1 children)

Even more interesting! Thanks!!

[–] [email protected] 9 points 7 months ago

Tatu was also a bit of a d*ck about the thing. There were some GPL violations when he made the licensing more restrictive, and at one point he accused the OpenSSH project of violating his trademark, even though his original license permitted the use of the ssh name.

[–] [email protected] 4 points 7 months ago (1 children)

As freeware or free software? Because if it was freeware, I don't understand how OpenBSD could have forked it

[–] [email protected] 2 points 7 months ago* (last edited 7 months ago)

It was a custom license more permissive than the BSD license.

It's still part of the official OpenSSH license, see the first section here: https://cvsweb.openbsd.org/src/usr.bin/ssh/LICENCE?rev=HEAD