Active 4 months ago. Viewed k times. Improve this question. Did you check your syslog configuration? How to check a syslog configuration? Unfortunately, i'm not very good a linux :. You are correct. Please write your answer so i can accept it : — grigoryvp. How the heck were we supposed to know that had anything to do with sshd?
Show 2 more comments. Active Oldest Votes. If no one else is using the system at the moment you could do what i've done in such cases: stop sshd service at least i've been able to do this while logged in via ssh start sshd manually and add some -d options to get more verbose debug output.
Unless you have something funky going on it should use the same keys and config it does when started properly. Improve this answer. Peto Peto 2 2 silver badges 4 4 bronze badges. Stopping SSHD on a remote server is a really bad idea. This may solve the problem for some or most setups most of the time, but if ANYTHING goes wrong - your connection, power on either end, forgetfulness, etc - you're locked out of the box.
Which is bad news. Well, it should be noted that the only way you could start the service after manually stopping it would be to have some other kind of access to it, like another non-SSH remote connection, or you're sitting in front of it.
How does this answer the question? I landed here from a web search expecting to learn how to check the SSHD log files, not what worked for you for some problem Damn I wish readers on the Stack Exchange network would actually read and answer the question at hand, and not the question they want it to be You can start another sshd on another port. Connect to that one. In this tutorial we will learn how to enable ssh log and check Linux command to list failed ssh login attempts.
By default, ssh logging is enabled, if not enable then enable SSH logging we need to configure the syslog. When SSH server runs, it will produce the log messages in sshd. These log messages will help the system administrator to track the system details such as who logged in and logged out and to troubleshoot the problem. This configuration file contains keyword-value pairs and one per line with keywords being case sensitive. In order to display a list of the failed SSH logins in Linux, issue some of the commands presented in this guide.
Make sure that these commands are executed with root privileges. The same result can also be achieved by issuing the cat command. In order to display extra information about the failed SSH logins, issue the command as shown in the below example. Issue the above command against this log file to identify failed SSH logins. To display a list of all IP addresses that tried and failed to log in to the SSH server alongside the number of failed attempts of each IP address, issue the below command.
On newer Linux distributions you can query the runtime log file maintained by Systemd daemon via journalctl command. In order to display all failed SSH login attempts you should pipe the result via grep filter, as illustrated in the below command examples. TecMint is the fastest growing and most trusted community site for any kind of Linux Articles, Guides and Books on the web. UserK UserK 2, 4 4 gold badges 18 18 silver badges 24 24 bronze badges.
You should also consider running sshd on a non-standard port. Also, it is possible to set up iptables to deny new connection attempts if a single IP attempts a new ssh connection X times in a minute. For me the issue was not fail2ban but sshguard, something I had never heard of — Ray Foss. Add a comment. Active Oldest Votes. Improve this answer. Serge Stroobandt 1, 3 3 gold badges 24 24 silver badges 35 35 bronze badges. Anthon Anthon Out of curiosity, does Ubuntu have the lastb command?
JoelDavis My Ubuntu Maybe it needs to be configure. Is this relevant? On Ubuntu Server Community Bot 1. Ramesh Ramesh I had checked Which version are you running? Done anything special to get that file? Shay Walters Shay Walters 1 1 silver badge 6 6 bronze badges.
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