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FAQ-Why Does the Port Scanning Tool Discover That the Firewall Opens All Ports

Publication Date:  2015-07-01 Views:  615 Downloads:  0

Issue Description

Why Does the Port Scanning Tool Discover That the Firewall Opens All Ports?

Solution

The firewall does not open all ports. The symptom occurs because the firewall has triggered SYN flood attack defense. When the port scanning tool is used, the firewall enables TCP proxy for the scanning packets. Therefore, the port scanning tool mistakes that the firewall opens all ports. You can disable SYN flood attack defense to verify the problem.

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