Linux – ssh login taking too long

linuxssh

I have a hardware which is flashed with the following operating system :
Linux colibri 2.6.26-colibri_pxa3xx #14
I have noticed that the ssh login as well as telnet takes too long, even though I try to login from the same subnet.

I do not see any unusual messages being logged in the /var/log/messages

I tried ssh -vvv and I can see that the delay is mainly due to the fetch in the remote protocol version. I have 2 identical machines flashed with the same OS and the behaviour occurs in one and not the other.
The lag i see is a considerable delay in fetching and displaying this message.

debug1: Remote protocol version 2.0, remote software version dropbear_0.49

Best Answer

First, to collect more info about the delay try connecting with verbosity enabled: ssh -vvv user@hostname. Second, try disabling the reverse DNS lookup - edit /etc/ssh/sshd_config on your device and setup UseDNS no. Restart the service and check again. Third, setup GSSAPIAuthentication no in the same file, restart the service and retry.

Here you can see a good example, I used it in the past.

Related Solutions

Ssh authentication nfs

Your ssh client is trying password authentication before public key authentication.

Check your ~/.ssh/config and /etc/ssh/ssh_config files for a PreferredAuthentications entry.

I see similar behavior if I add the following entry to my ~/.ssh/config file:

PreferredAuthentications password,publickey

If you have something like that in either of the aforementioned files, comment it out.

Ssh – How to manage ssh keys to add a second user

You need to login using the putty on the windows machine and exit the .ssh/authorized_keys file and add the key that you generated on the mac to the file.

Do not run the command

scp -2 -P 50022 -v ~/.ssh/id_rsa.pub newuser@111.222.333.444:

That will over write the existing key on the server, and it will not work either as the server only accepts key logins.

Best Answer

Related Solutions

Ssh authentication nfs

Ssh – How to manage ssh keys to add a second user

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