Symptom:
[anthony@fc18 ~]$ ssh -l userA 10.10.10.1 -v
OpenSSH_6.1p1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 50: Applying options for *
debug1: Connecting to 10.10.10.1 [10.10.10.1] port 22.
debug1: Connection established.
debug1: identity file /home/anthony/.ssh/id_rsa type -1
debug1: identity file /home/anthony/.ssh/id_rsa-cert type -1
debug1: identity file /home/anthony/.ssh/id_dsa type -1
debug1: identity file /home/anthony/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH_4*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024 p="" 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: Host '10.10.10.1' is known and matches the RSA host key.
debug1: Found key in /home/anthony/.ssh/known_hosts:12
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
#### connections seems to be hanging starting from here for more than 5 seconds #####
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Trying private key: /home/anthony/.ssh/id_rsa
debug1: Trying private key: /home/anthony/.ssh/id_dsa
debug1: Next authentication method: password
gzchin@10.10.10.1's password:
Resolution:
If your server does not has any Internat access / DNS server for name resolution.
Set this in sshd_config and restart SSHD server.
UseDNS no
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