SK0-004 · Question #191
An administrator receives multiple reports that users cannot access a secure website hosted on a server the administrator manages. The administrator investigates and discovers that the reason users…
The correct answer is C. port 443 is closed. Users cannot reach the secure website because HTTPS traffic runs on port 443, and that port is closed on the server.
Question
An administrator receives multiple reports that users cannot access a secure website hosted on a server the administrator manages. The administrator investigates and discovers that the reason users cannot access the secure site is because:
Options
- Aport 22 is closed.
- Bport 80 is closed.
- Cport 443 is closed.
- Dport 3389 is closed.
How the community answered
(37 responses)- A5% (2)
- B3% (1)
- C92% (34)
Why each option
Users cannot reach the secure website because HTTPS traffic runs on port 443, and that port is closed on the server.
Port 22 is assigned to SSH (Secure Shell), a remote administration protocol, and has no role in serving HTTPS web content.
Port 80 is used for unencrypted HTTP traffic, not for secure HTTPS connections, so closing it would only affect non-secure web access.
Port 443 is the IANA-assigned well-known port for HTTPS (HTTP over TLS/SSL), which is the protocol used by all secure websites. When port 443 is closed or blocked by a firewall, clients cannot complete the TLS handshake and the secure connection is refused. Any server hosting a secure site must have port 443 open and listening for inbound connections.
Port 3389 is assigned to RDP (Remote Desktop Protocol) for remote desktop sessions and is unrelated to web server access.
Concept tested: Well-known port numbers for HTTPS
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/service-overview-and-network-port-requirements
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