At some locations you may find that ssh pauses somewhere around ten seconds between the connection and the login prompt. I find this happens on LANs where reverse DNS isn’t working right. (Such as when I’m playing with DNS at my office and break something. Did I admit to that? lol)

On the remote server,

1. sudo vim /etc/ssh/ssd_config
2. Locate UseDNS.
3. Change it to: UseDNS no
4. Save the file and exit vim.
5. Restart sshd. On CentOS 5: sudo /sbin/service sshd restart