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Unable to login to SSH even with a correct password

 In Linux world, SSH is a life. Especially, now with remote work, data center, servers without graphical interface. If you can't login via SSH,  even with a correct password but other user accounts is able to login. Then the person need to check with HR whether he or she is still on the payroll. :)  😄

Of course, glitch, errors and other issues will always be a part of this technology. Nothing is perfect in this world, so errors, technological issues will always be there it won't go away.

So, what will will you do if you are sure that the SSH password and username is correct? Like you can login to Server 1, Server 2 but unable to login with Server 3 using the same credentials? If other users with sudo credentials are still able to login, the sudo account can be used to troubleshoot the specific SSH account that is having the issue.

What would be the first thing to do?

Well, joke as it seems that "restart works always" but the reality is not far from there. Restart SSHD service since it's the one that handles SSH connection.

systemctl restart sshd  << This would be the first thing to do then try again.

If restarting the service, doesn't work. Then checking logs, will not hurt to find some clues.

However, if restarting sshd did not work and logs does not provide any ideas.

Then, try restarting System Security Services Daemon (SSSD). This service is somehow connected to an LDAP service, so if you are using LDAP in your environment then restarting this service might help.

systemctl restart sssd  << Try restarting this service  and check if it will help, this will not reboot the VM or the physical machine so it is safe to issue this command

After restarting this service and everything works, then I guess it is your lucky day.

However, if still unable to login via SSH with a correct username and password. Then I guess if the opportunity allows to reboot the server, then its better to do it.

Or if there's a documentation on what was the last thing done to the server, then its better to undo what was done and check if able to login successfully. 

If still doesn't work, then need to check other possible steps on how to resolve the issue, just like checking if public SSH keys are present; or the system is not blocking or restricting user accounts.



Cheers! Take care. Till next Time.

Stay safe! and Keep things up! 

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Practice O.T.G. = Obedience To God

Make time for Prayer and Meditation.

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