Could not load host key: /etc/ssh/ssh_host_ecdsa_key

on openbsd, u can reload ssh by just running the binary

/usr/sbin/sshd
Could not load host key: /etc/ssh/ssh_host_ecdsa_key

If you see this error, create the ecdsa key with the following command:

ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ""