SSHD Tweaks

Mr_Munkey · 01-06-2005, 10:55 AM

Hello,

Some of my servers take a long time to ask me for the password when I put in the username when logging in through SSH. Is there a way to configure how long it waits to ask, or something to tweak it to be faster? It's taking like 10 to 15 seconds and is getting annoying

Thanks!

y0shidono · 01-06-2005, 02:01 PM

when you ssh to the machine, do so with the verbose output:

ssh -v machinename

This could help you zero in on which step in the login process is holding up your connection, and remove it from your ssh_config (or ~/.ssh/config) file.

twantrd · 01-06-2005, 05:38 PM

Ahh, I remember having this mind boggling problem. Look at your resolv.conf file. Check that you have correct nameservers in there. If so, then you don't have a PTR record for that host you are trying to connect. Yes, when you read this you would be "uhh, no. My problem is with ssh, not DNS." They are related.

.

Another way to handle this is in your sshd_config, change it to:
UseDNS no

-twantrd

Mr_Munkey · 01-07-2005, 08:26 AM

Thanks for all the input. I actually didn't have UseDNS in the config file, and when I tried to put it in there OpenSSH didn't like it. I did find some information in the man pages that said to pass the "-u0" option when starting SSHD. This will cause it to not do reverse DNS checking for the logging at least. It is performing a lot better now.

Thanks