slex fails after FCOS Upgrade

[brose0]

We recently updated our Fedora CoreOS to 33.20210117.3.2. I notice during the upgrade my slex commands fail on the new version. I'm connecting from a Centos7 server.

• slex --host <my host> -u <my user> hostname fails with the following:
<my host>:22: ERROR none of the provided authentication methods can establish SSH session successfully

• Slex returns the hostname on the previous version of FCOS. I've tried FQDN, short name and IP address for the host.

• SSH commands work fine as well (e.g. ssh <my user>@<my host> hostname)

[brose0]

Looks like ssh-rsa was removed from PubkeyAcceptedKeyTypes.

https://docs.fedoraproject.org/en-US/fedora-coreos/faq/#_why_does_ssh_stop_working_after_upgrading_to_fedora_33

This isn't an issue with updated ssh clients so I'm assuming slex has ssh baked in. I haven't tested but it looks like a workaround is to update your ssh key to something other than RSA. There are other workarounds in that article. If slex was updated to use a more current ssh client that should work too (assuming that I'm right about it being baked into slex).