Newbie Security Concerns

[crzdgns1 at starpower.net]

Hello,

I am a new user of UNIX and FreeBSD and have never had to do any 
administration or security configuration myself before.  I am running 
IP Firewall on FreeBSD-5.3-RELEASE.  Last night I was checking my 
logs and discovered  that sshd reported many illegal users.  Does 
that mean my system i compromised?  As configured, there are only 
three accounts on my system, root, toor, and one user account for 
me.  I suppose you need more information from me, but am not sure 
what to provide.  Any help would be greatly appreciated.

Thanks

Mark