GitHub に ssh で接続できなくなりました。

**~/.ssh/config**

```

    Host github.com
      User git
      Hostname github.com
      IdentityFile ~/.ssh/鍵名
      Port 443
    
```

**実行ログ**

```

    ssh: Could not resolve hostname github: nodename nor servname provided, or not known
    XXX@YYY .ssh %  ssh -vT  git@github.com
    OpenSSH_8.1p1, LibreSSL 2.7.3
    debug1: Reading configuration data /Users/XXX/.ssh/config
    debug1: /Users/XXX/.ssh/config line 1: Applying options for github.com
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug1: /etc/ssh/ssh_config line 47: Applying options for *
    debug1: Connecting to github.com port 443.
    debug1: Connection established.
    debug1: identity file /Users/XXX/.ssh/鍵名 type 0
    debug1: identity file /Users/XXX/.ssh/鍵名-cert type -1
    debug1: Local version string SSH-2.0-OpenSSH_8.1
    debug1: kex_exchange_identification: banner line 0: HTTP/1.1 400 Bad Request
    debug1: kex_exchange_identification: banner line 1: Server: openresty/1.11.2.1
    debug1: kex_exchange_identification: banner line 2: Date: Thu, 08 Oct 2020 06:07:13 GMT
    debug1: kex_exchange_identification: banner line 3: Content-Type: text/html
    debug1: kex_exchange_identification: banner line 4: Content-Length: 179
    debug1: kex_exchange_identification: banner line 5: Connection: close
    debug1: kex_exchange_identification: banner line 6: 
    debug1: kex_exchange_identification: banner line 7: <html>
    debug1: kex_exchange_identification: banner line 8: <head><title>400 Bad Request</title></head>
    debug1: kex_exchange_identification: banner line 9: <body bgcolor="white">
    debug1: kex_exchange_identification: banner line 10: <center><h1>400 Bad Request</h1></center>
    debug1: kex_exchange_identification: banner line 11: <hr><center>openresty/1.11.2.1</center>
    debug1: kex_exchange_identification: banner line 12: </body>
    debug1: kex_exchange_identification: banner line 13: </html>
    kex_exchange_identification: Connection closed by remote host
    
```

22ポートだと下記が表示され、タイムアウトになってしまいます。

```

    XXX@YYY .ssh %  ssh -vT  git@github.com       
    OpenSSH_8.1p1, LibreSSL 2.7.3
    debug1: Reading configuration data /Users/XXX/.ssh/config
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug1: /etc/ssh/ssh_config line 47: Applying options for *
    debug1: Connecting to github port 22.
    
```

色々調べたのですが、わからず、どなたかに解決策をご教示いただきたいです。
CC BY-SA 4.0
2020-10-08T06:14:05.960
71010
2020-10-08T11:29:23.720
2020-10-08T11:29:23.720
32986
42233
question
github ssh
GitHub に ssh で接続できない