ssh delay about 16 seconds

[Maaz]

ssh client OS: rhel 4
ssh server OS: rhel 4

I ssh my "ssh server", it takes almost 12 seconds before getting the promt(password prompt) back.
#ssh 10.0.0.5
<12 seconds wait>
root@10.0.0.5's password:

I did 'ssh -v 10.0.0.5' and found that the cause of delay(of abt 12 secs) is "Authentication Method".

excerpt from 'ssh -v 10.0.0.5'
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Next authentication method: gssapi-with-mic
debug1: An invalid name was supplied
Cannot determine realm for numeric host address

debug1: An invalid name was supplied
Cannot determine realm for numeric host address

debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/identity
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Next authentication method: password
root@10.0.0.5's password:

plz help
Regards

[Ivan Ferreira]

To identify if it's a DNS reverse lookup problem, configure:

/etc/ssh/sshd_config

UseDNS no

[Ivan Ferreira]

Forgot to say that you need to reload the service:

service sshd reload

[Maaz]

I simply comment and delay gone
GSSAPIAuthentication yes
to
#GSSAPIAuthentication yes

Thanks anyway
Regards

[Andre Lejeune]

I had a similar problem and disabling DNS worked.

[Siert Zijl]

The server is unable to resolve the IP address you are coming from.

Make sure reserve DNS is working correctly or put your source IP address and hostname in the /etc/hosts file.

If the server does resolve correctly, please check how long it takes to do the reserve DNS lookup (command: dig ipaddress).

If you don't need resolving at all, disable DNS lookups in /etc/ssh/sshd_config "UseDNS no" as others preferred before.