SSH from older Linux versions to Alma Linux 9

Security
8

Hi,

You can test:

Option 1: In Almalinux 9, execute

update-crypto-policies --set DEFAULT:SHA1
reboot

Option 2: In Almalinux 9, add the next config :

RSAMinSize 1024
PubkeyAcceptedKeyTypes +ssh-rsa

In file:

/etc/crypto-policies/back-ends/opensshserver.config

reboot