Intrusion Attempts ?

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I have a SBS2000 system and daily receive the following ISA server intrusion
notifications.

ISA Server name: ABCSERVER
ISA Server detected a well-known port scan attack from Internet Protocol
(IP) address 80.176.209.174. A well-known port is any port in the range of
1-2048. For more information about this event, see ISA Server Help.

What steps can I take if any, is this a genuine intrusion attempt or
possibly a virus infected system somewhere ?

Thanks in Advance

Gary


.

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