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Locked myself out of SSH by installing firewalld

Accepted answer

I installed firewalld and it caused me to exit the SSH session.

I couldn't log in with cloud shell because it asked me for password, and I'm not even sure if I had one set up. I have the original private key and public keys.

I tried SSHing via a serial connection through WSL, but it failed with the error:

$ ssh -i -o ProxyCommand='ssh -i -W %h:%p -p 443' ocid1.instance.oc1.iad.YYYY

Unable to negotiate with port 443: no matching host key type found. Their offer: ssh-rsa
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535

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