An engineer must profile new servers that have been released recently and must identify running web services on nonstandard ports. Why is the probe returning no result?

The correct answer is A. Port 80 or 443 is blocked by the firewall. When profiling servers for running web services, if the probe returns no results, it is likely because the standard ports used for web services (HTTP on port 80 and HTTPS on port 443) are being blocked by a firewall. This prevents the probe from establishing connections and…

Submitted by tunde_lagos· Mar 6, 2026Network Intrusion Analysis

Question

Options

APort 80 or 443 is blocked by the firewall.
BServers use IPs from the DHCP server.
CThe policy Is allowing Initial collection of data.
DListening ports can use a range between 1 and 65535.

How the community answered

(24 responses)

A
79% (19)
B
13% (3)
C
4% (1)
D
4% (1)

Explanation

When profiling servers for running web services, if the probe returns no results, it is likely because the standard ports used for web services (HTTP on port 80 and HTTPS on port 443) are being blocked by a firewall. This prevents the probe from establishing connections and identifying services running on these ports.

Topics

#Firewall Rules#Port Scanning#Network Profiling#Web Services

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