I have this same issue, but on Fedora (yes, I realize this is an ubuntu forum)
On Fedora, I have the issue on 5.2 openssh (FC10+) but not on 5.1 (FC9) If a host is in the hosts file, it connects instantly. If it needs to check DNS, it takes 15 seconds or more to connect. There's no slowness to my DNS servers. A tcpdump shows that when connecting from a host not in the hosts file, it queries the DNS server multiple times at multiple phases of the connection. If I change UseDNS to no in the sshd_config, it works fine. However that disables other things, such as host resolution for anchoring ssh keys to a "from=" address. It can still be done with IP addresses, but for my users who connect from dynamic IPs such as from comcast, they can no longer lock their ssh keys down, which is a problem. -- Logins to OpenSSH server slow due to "UseDNS yes" config https://bugs.launchpad.net/bugs/424371 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
