![]() The only difference is that, DENY_THRESHOLD_VALID applies to existing users on the denyhosts-server machine. This option is same as DENY_THRESHOLD_INVALID. You should see the IP address of the computer you tried to login as non-existent user baduser there. Note that the user baduser does not exists in the denyhosts-server. Now I am going to try to connect to the server as baduser. The IP address of the other computer I will try to connect to the denyhosts-server is 192.168.10.92 You can see from the screenshot below that the IP address of my denyhosts-server is 192.168.10.66 If the attempt is in total more than 5 times, then the IP address of the computer trying to establish a connection will be appended to the /etc/ny file, thus the computer won’t be able to connect to the SSH server till it’s removed from the /etc/ny file. What that means is, let’s say someone is trying to login to the SSH server as different guessed usernames. This option is responsible for blocking SSH logins for user accounts that do not exist on the system. Now let’s look at some of the properties in DenyHosts configuration file and how they work. This is how the configuration file of DenyHosts looks like.
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