title: ssh -vT git@github.com kex_exchange_identification: Connection closed by remote host
body: <p><a href="https://i.stack.imgur.com/ViVNM.png" rel="nofollow noreferrer">the way I config the ssh-key, </a>I generate a new ssh key, add to my github,but something is wrong, I try many ways,but I can not.</p>
  
  <pre><code>$ ssh -vT git@github.com
  OpenSSH_8.1p1, OpenSSL 1.1.1d  10 Sep 2019
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Connecting to github.com [111.40.234.2] port 22.
  debug1: Connection established.
  debug1: identity file /c/Users/dell/.ssh/id_rsa type 0
  debug1: identity file /c/Users/dell/.ssh/id_rsa-cert type -1
  debug1: identity file /c/Users/dell/.ssh/id_dsa type -1
  debug1: identity file /c/Users/dell/.ssh/id_dsa-cert type -1
  debug1: identity file /c/Users/dell/.ssh/id_ecdsa type -1
  debug1: identity file /c/Users/dell/.ssh/id_ecdsa-cert type -1
  debug1: identity file /c/Users/dell/.ssh/id_ed25519 type -1
  debug1: identity file /c/Users/dell/.ssh/id_ed25519-cert type -1
  debug1: identity file /c/Users/dell/.ssh/id_xmss type -1
  debug1: identity file /c/Users/dell/.ssh/id_xmss-cert type -1
  debug1: Local version string SSH-2.0-OpenSSH_8.1
  kex_exchange_identification: Connection closed by remote host
  </code></pre>
  
  <p>what can I do?</p>