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Jul 01, 2014 · Another possibility for slow SSH login is reverse DNS lookup. On Linux distros such as Ubuntu, when an SSH server receives a login request from a client, the server performs reverse DNS lookup of the client's IP address for security reason. If the reverse DNS lookup fails, lookup timeout will add to SSH login delay.
it doesn't seems to be a problem with ssh connectivity, it looks to be something else on system side. But if you still feel that is an ssh connectivity which is slow then try doing ssh in verbose mode (ssh -vvv [email protected]) and also check using IP address instead of hostname while doing ssh.
Afterwards connections with SSH worked within a second. Network Settings -> Router Settings -> Enable DNS Relay [x] The default configuration forwards every DNS request to the provider. It was slow although I was connecting with ssh [email protected] A hint to the solution was an entry in /etc/resolv.conf "search upc.at" which is provided via dhcp.
The most common cause of slow SSH login authentications is DNS. To fix this one, go to the SSH server , edit /etc/ssh/sshd_config , and set UseDNS no . You’ll need to restart the service after changing sshd_config: /etc/init.d/ssh restart, systemctl restart ssh, etc as appropriate.
You can also tell SSH to disable DNS lookups like this: [[email protected] ~]# vim /etc/ssh/sshd_config And change the “UseDNS yes” field to “UseDNS no”. This will ensure that SSH doesn’t try to do any reverse lookups.
Mar 27, 2012 · And sometimes it takes a lot of time for login prompt to come up and once password is entered it takes lot of time to login. I Googled and found that slow login prompt could be because of DNS and I changed the DNS and login prompts are almost instantaneous. However it still takes time after entering the password. ... The ssh server is CentOS 5 ...
Basically the session is slow to start because the SSH server is trying to lookup the hostname of the SSH client and for whatever reason it's timing out (e.g., it can't reach a nameserver, because you happen to be offline) There are a couple of very simple ways to fix that: add "UseDNS no" to /etc/ssh/sshd_config
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