在linux中，預設就是開啟了ssh的反向dns解析,這個會消耗大量時間，因此需要關閉。
# vi /etc/ssh/sshd_config
usedns=no
在authentication gssapi-with-mic有很大的可能出現問題，因此關閉gss認證可以提高ssh連線速度。
# vi /etc/ssh/sshd_config
gssapiauthentication no
service sshd restart測試一下ssh鏈結卡在那個地方
[xiao@localhost ~]$ ssh -v [email protected]
openssh_5.3p1, openssl 1.0.1e-fips 11 feb 2013
debug1: reading configuration data /etc/ssh/ssh_config
debug1: connecting to 192.168.174.149 [192.168.174.149] port 22.
debug1: connection established.
debug1: identity file /home/xiao/.ssh/identity type -1
debug1: identity file /home/xiao/.ssh/identity-cert type -1
debug1: identity file /home/xiao/.ssh/id_rsa type -1
debug1: identity file /home/xiao/.ssh/id_rsa-cert type -1
debug1: identity file /home/xiao/.ssh/id_dsa type -1
debug1: identity file /home/xiao/.ssh/id_dsa-cert type -1
debug1: identity file /home/xiao/.ssh/id_ecdsa type -1
debug1: identity file /home/xiao/.ssh/id_ecdsa-cert type -1
debug1: remote protocol version 2.0, remote software version openssh_5.3
debug1: match: openssh_5.3 pat openssh*
debug1: enabling compatibility mode for protocol 2.0
debug1: local version string ssh-2.0-openssh_5.3
debug1: ssh2_msg_kexinit sent
debug1: ssh2_msg_kexinit received
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug1: kex: client->server aes128-ctr hmac-sha1 none
debug1: ssh2_msg_kex_dh_gex_request(1024<2048<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
the authenticity of host '192.168.174.149 (192.168.174.149)' can't be established.
rsa key fingerprint is 01:e2:4c:36:39:b6:5a:de:28:87:92:1d:6a:74:2a:e0.
are you sure you want to continue connecting (yes/no)?
warning: permanently added '192.168.174.149' (rsa) to the list of known hosts.
debug1: ssh_rsa_verify: signature correct
debug1: ssh2_msg_newkeys sent
debug1: expecting ssh2_msg_newkeys
debug1: ssh2_msg_newkeys received
debug1: ssh2_msg_service_request sent
debug1: ssh2_msg_service_accept received
debug1: authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: next authentication method: gssapi-keyex
debug1: no valid key exchange context
debug1: next authentication method: gssapi-with-mic
debug1: unspecified gss failure. minor code may provide more information
cannot determine realm for numeric host address
debug1: unspecified gss failure. minor code may provide more information
cannot determine realm for numeric host address
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