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[cobalt-security] Interpreting Log Files?



Could you point me to a source that explains how to interpret log files? For instance did the following person "connect" to my machine? Is says "opened" and "connected", but also "no user found". I'm not sure what this means. I get a lot of these from Europe.

Sep 8 06:51:42 ns1 proftpd[24656]: 216.27.65.154 (AMetz-101-1-3-114.abo.wanadoo.fr[80.11.17.114]) - FTP session opened.
Sep  8 06:51:41 ns1 in.proftpd[24656]: connect from 80.11.17.114
Sep 8 06:51:42 ns1 proftpd[24656]: 216.27.65.154 (AMetz-101-1-3-114.abo.wanadoo.fr[80.11.17.114]) - USER anonymous: no such user found from AMetz-101-1-3-114.abo.wanadoo.fr [80.11.17.114] to 216.27.65.154:21

Thanks!

Reed