Port scanning question

[Thom Larner <thom () thiri com au>]

Hi all,

As a relative newcomer to the security field, but with a reasonable amount
of experience in sys admin roles, I am now responsible for the network
security of the (small) company I work for.  One of the things I would like
to do is determine if (when) our web server, which hosts our applications,
is being port scanned.  How do I go about this?  Are there (free or cheap)
tools that will help you do this?  We run both Solaris and W2K Server boxes,
and I would like to check both.

Now I just have to determine what, if anything, to do if (when) we are being
scanned...

Thanks in advance for your help.

Cheers,

Thom.

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