Unexceptable Log Files

[SoloCDM]

I had log files in /var/log/samba (more than one log.[user]) that had
no reason to exist on this network.  How are outsiders able to get in
and what can I do to keep them out?  Is it a Samba or some other type
of security issue?  On what port would the invasion occur?  All
settings are at there standard installation configuration.

Note: Detailed Document(s) and Sample(s) are more than welcome.
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Signed,
SoloCDM