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I was trying SFTP Chroot Jail, and while doing so, i ran into some problems. So i wanted to debug ssh connection - to know why i am not able to connect? In the end, i solved the problem. But while searching internet on how to debug sshd, i came across many tutorials like this one 'How can I run Openssh daemon in debug mode?'.
But i am not getting any debug messages at all.
This is what i did: (Pls see attached ScreenShot)
(Left-Top): On Server, issued command '/usr/sbin/sshd -p 12345 -D -d -e', to start ssh daemon in debug mode.
(Left-Bottom): From client, ssh to server as wrong user and also as correct user. I was hoping that debug messages will scroll up on server monitor. But nothing happened... not even cursor moved.
(Right): So, to verify, i opened /var/log/secure file, and everything seems fine. all the right noises are made.
What i'm doing wrong? Am i wrong that i am expecting some messages will scroll on server monitor in debug mode? Where are debug messages shown...
+1 to jpollard's post; I had nearly the same exact issue arise on me about two weeks ago, and my firewall on my network was at fault the whole time. Tip: When you are using odd port numbers for ssh, remember to account for that in your firewall