Re-enable older SSH clients to connect with newer servers

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I run Manjaro on my main desktop, but it has recently disabled certain old ciphers from connecting. That is generally a good thing: older ciphers aren't as secure.

However, I have a windows 98 computer for retro computing purposes, and I like to use (an ancient version of) WinSCP to copy over files from my main linux machine. But it only knows old ciphers, so I was unable to connect to the linux computer.

All I had to do, was enable a single old cipher in the /etc/ssh/sshd_config file. By adding this option:

KexAlgorithms +diffie-hellman-group1-sha1

Then I had to restart the SSH server and voila, it works!

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Jelle De Loecker