By default diffie-hellman-group14-sha1 is disabled in Red Hat 9:

> ssh 10.0.0.1
> Unable to negotiate with 10.0.0.1 port 22: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1

You can enable the support for the key exchange method:

> update-crypto-policies --set DEFAULT:SHA1
> reboot the server

! you should consider updating the remote site thou !

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