|Securing and Optimizing Linux: RedHat Edition -A Hands on Guide|
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If you believe that your system has been compromised, contact CERT Coordination Center or your representative in FIRST -Forum of Incident Response and Security Teams.
CERT/CC personnel answer 8:00 a.m. to 8:00 p.m. EST (GMT 5)/EDT (GMT 4))
on working days; they are on call for emergencies during other hours and on weekends and
Internet Email: <email@example.com>
CERT Hotline:(+1) 412-268-7090
Facsimile: (+1) 412-268-6989