Solved: SSH: connection closed by remote host - Intel Communities
How to Fix ssh: connect to host port 22: Connection refused. - YouTube
SSH tunneling explained - #23 by Borz - Part 1 (2018) - fast.ai Course Forums
git - Github Error "ssh: connect to host github.com port 22: Resource temporarily unavailable fatal: Could not read from remote repository." - Stack Overflow
GitHubへのsshログインも楽したい!よくある接続エラーもまとめたよ! - RAKUS Developers Blog | ラクス エンジニアブログ