CompTIA Security+ (SY0-501) — Question 411

When accessing a popular website, a user receives a warming that the certificate for the website is not valid. Upon investigation, it was noted that the certificate is not revoked and the website is working fine for other users.
Which of the following is the MOST likely cause for this?

Answer options

• A. The certificate is corrupted on the server.
• B. The certificate was deleted from the local cache.
• C. The user needs to restart the machine.
• D. The system date on the user's device is out of sync.

Correct answer: D

Explanation

The correct answer is D because if the system date on the user's device is incorrect, it can lead to certificate validation errors, making the certificate appear invalid. Option A is incorrect as a corrupted certificate would likely affect all users, not just one. Options B and C are less relevant as they do not directly relate to certificate validity issues.