A technician receives an invalid certificate error when visiting a website with port 443 enabled. Other computers on the same LAN do not exhibit this symptom. Which of the following needs to be…

The correct answer is A. Date and time. SSL/TLS certificates contain a validity period defined by a 'Not Before' and 'Not After' date. If a workstation's system clock is significantly wrong - either too far in the past or future - the browser will consider the certificate invalid because the current date falls…

Networking

Question

A technician receives an invalid certificate error when visiting a website with port 443 enabled. Other computers on the same LAN do not exhibit this symptom. Which of the following needs to be adjusted on the workstation to fix the issue?

Options

ADate and time
BUEFI boot mode
CLogon times
DUser access control

How the community answered

(66 responses)

A
80% (53)
B
6% (4)
C
3% (2)
D
11% (7)

Explanation

SSL/TLS certificates contain a validity period defined by a 'Not Before' and 'Not After' date. If a workstation's system clock is significantly wrong - either too far in the past or future - the browser will consider the certificate invalid because the current date falls outside the certificate's valid window. Since only this one workstation has the problem while others on the same LAN do not, this rules out a server-side or network issue and points to a local workstation misconfiguration. An incorrect date/time is the most common cause of isolated certificate errors. UEFI boot mode (B), logon times (C), and User Access Control (D) have no effect on SSL certificate validation.

Topics

#SSL certificate error#date and time#HTTPS#certificate validation

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