Ssh: kex_exchange_identification: read: Operation timed out

I’m trying to setup my mac environment to push code to github over SSH
Yet, ssh doesn’t work.
Has anybody seen this issue? Am I doing something wrong?

$ ssh -vT git@github.com
OpenSSH_8.1p1, LibreSSL 2.7.3
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 50: Applying options for *
debug1: Connecting to github.com port 22.
debug1: Connection established.
debug1: identity file /var/root/.ssh/id_ed25519 type -1
debug1: identity file /var/root/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.1
kex_exchange_identification: read: Operation timed out

It has been resolved by following the link (https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/using-ssh-over-the-https-port)