title: SSH, Connection established, but stuck
body: <p>I can ssh to server in my house, but I fail to ssh by some VPN or public wifi(not all). when I type <code>ssh -v user@server.domain</code>, I got this:</p>
  
  <pre><code>OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
  debug1: Reading configuration data /etc/ssh_config
  debug1: /etc/ssh_config line 20: Applying options for *
  debug1: /etc/ssh_config line 102: Applying options for *
  debug1: Connecting to server.domain [server.ip.address] port 22.
  debug1: Connection established.
  debug1: identity file /Users/Hung/.ssh/id_rsa type 1
  debug1: identity file /Users/Hung/.ssh/id_rsa-cert type -1
  debug1: identity file /Users/Hung/.ssh/id_dsa type -1
  debug1: identity file /Users/Hung/.ssh/id_dsa-cert type -1
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_6.2
  </code></pre>
  
  <p>and then, no response for as long as it can be. anybody could help? the following is normal one:</p>
  
  <pre><code>OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
  debug1: Reading configuration data /etc/ssh_config
  debug1: /etc/ssh_config line 20: Applying options for *
  debug1: /etc/ssh_config line 102: Applying options for *
  debug1: Connecting to server.domain [server.ip.address] port 22.
  debug1: Connection established.
  debug1: identity file /Users/Hung/.ssh/id_rsa type 1
  debug1: identity file /Users/Hung/.ssh/id_rsa-cert type -1
  debug1: identity file /Users/Hung/.ssh/id_dsa type -1
  debug1: identity file /Users/Hung/.ssh/id_dsa-cert type -1
  debug1: Enabling compatibility mode for protocol 2.0
  debug1: Local version string SSH-2.0-OpenSSH_6.2
  debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
  debug1: match: OpenSSH_5.3 pat OpenSSH_5*
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: server-&gt;client aes128-ctr hmac-md5 none
  debug1: kex: client-&gt;server aes128-ctr hmac-md5 none
  debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024&lt;1024&lt;8192) sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
  debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
  debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
  debug1: Server host key: RSA 15:6e:7a:db:35:7c:6a:ba:3e:c0:c1:24:4d:5a:be:a8
  debug1: Host 'server.domain' is known and matches the RSA host key.
  debug1: Found key in /Users/Hung/.ssh/known_hosts:13
  debug1: ssh_rsa_verify: signature correct
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug1: SSH2_MSG_NEWKEYS received
  debug1: Roaming not allowed by server
  debug1: SSH2_MSG_SERVICE_REQUEST sent
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive
  debug1: Next authentication method: publickey
  debug1: Offering RSA public key: /Users/Hung/.ssh/id_rsa
  debug1: Server accepts key: pkalg ssh-rsa blen 279
  debug1: Authentication succeeded (publickey).
  Authenticated to server.domain ([server.ip.address]:22).
  debug1: channel 0: new [client-session]
  debug1: Requesting no-more-sessions@openssh.com
  debug1: Entering interactive session.
  debug1: Sending environment.
  debug1: Sending env LC_CTYPE = UTF-8
  </code></pre>