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Questions concerning Security Log

As I'm still new to linux I like to open things and see what they are
/ do. So I opened the KDE System Logs program, clicked on over to
Security logs, and found a bunch of these:

Apr  4 02:15:03 localhost sshd[26567]: Failed password for invalid
user test from ::ffff: port 3429 ssh2

and these:

Apr  5 04:47:24 localhost sshd[7287]: reverse mapping checking
getaddrinfo for h169-210-68-8.adcast.com.tw failed - POSSIBLE BREAKIN

and many more like it. Is this something to worry about? Chkrootkit
didn't find anything suspicious, so that makes me feel a little
better, but as I am unable to start firestarter I am a little nervous.

By the way, what is the difference between chkrootkit and chkrootkitX?
They both run in the terminal (I thought that chkrootkitX would open
up in a gui or something).

Is it unsafe to put a copy of the log on my site and post a link to it
here? it spans about 1500 lines, so I do not want to email it to the

Thanks all! You guys have always been so helpful!

Dotan Cohen


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