Nessus is a remote security scanning tool, which scans a computer and raises an alert if it discovers any vulnerabilities that malicious hackers could use to gain access to any computer you have connected to a network. Nessus discovers vulnerabilities for security specialist to analyze and harden their systems. Nessus Scans can become ineffective if ran behind a firewall. It’s always best to run a credentialed scan to receive full test results. Nessus Scan isn’t made to fully secure your environment as it doesn’t implement Physical or Access Controls.
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Hi Kyuande,
I agree Nessus can be ineffective at times, although it is a great open source tool, it also registers many false positives. They also have a limited library of exploits to test for. It’s a great tool for preliminary scans but shouldn’t be used as the main vulnerability monitor.