[CentOS] Strange SSH login try.

Dominik Składanowski dskladanowski at gmail.com
Mon Mar 13 12:37:59 UTC 2006

> > Today I saw something strange in logs one of my servers. Part of the
> > /var/log/security:
> >
> > [ ... ]
> >
> > "abcdefgh" is my username to the different machine in the other
> > domain, x.x.x.x it's my workstation. Yesterday, I loged into machine
> > where my login is "abcdefgh" from x.x.x.x. But not to the "server".
> >
> > Anybody has an idea?
> looks like a dictionary attack to me; i get these all the time,
> sometimes with sufficient intensity that they crash my gateway router
> (boo!).  these have been discussed recently on-list:
> 1) consider running sshd on a nonstandard port to dodge the bulk of this

SSH on "server" is moved from port 22.

> 2) consider using port knocking (i think i remember apf being one
> suggested package)
> 3) make sure you haven't enabled ssh login for any of the generic
> accountnames they use, and make sure your passwords are strong

As I remember, I tried to log to server where my username is
"abcdefgh" using Konqueror and sftp protocol and I couldn't. Today it

                         D o m i n i k    S k ł a d a n o w s k i

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