How to Fix ssh Pausing When Connecting

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, edit the SSH dæmon configuration file thus:

  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

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