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‘Invalid Security Certificate’ Message

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This error is caused by Man-in-the-Middle (MITM) protection, which occurs when an application or service (e.g., antivirus software) tries to monitor your traffic.

  1. Cause: The certificate details may have changed due to interference, such as a firewall inspecting traffic.
  2. Solution:
    • Investigate certificates stored on your device. Refer to guides likethis one.
    • Review ApexGuard’s blog post on web certificates for additional guidance.
  3. Example: If the error is caused by a Cisco firewall, and you trust the website, it is safe to proceed.

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