Step-by-Step Guide: How to Fix “NET::ERR_CERT_AUTHORITY_INVALID” on QNAP



Ever encountered the dreaded “NET::ERR_CERT_AUTHORITY_INVALID” warning on your QNAP server? This isn’t just an annoyance; it’s a red flag indicating your server lacks proper security measures. Leaving this warning unaddressed exposes your data and users to potential vulnerabilities. Rest assured, there’s no need to panic! This guide will walk you through responsible solutions to eliminate the warning and secure your QNAP server for good. We’ll explore options like obtaining a trusted SSL certificate, utilizing a reverse proxy, and addressing potential configuration issues. Let’s get your server protected and ensure a safe and secure environment for yourself and your users.

Here is how to add exception

Other option is to install the SSL certificate



Installing an SSL certificate on a QNAP NAS (Network Attached Storage) device is a great way to enhance the security of your network storage, especially if you access it over the internet. SSL (Secure Sockets Layer) certificates encrypt the data transferred between your QNAP NAS and connected devices, protecting it from interception or tampering.

Here is a step-by-step guide to installing an SSL certificate on a QNAP NAS. This process involves obtaining an SSL certificate, uploading it to your QNAP device, and then configuring the NAS to use the certificate for its services.

1. Obtain an SSL Certificate

Before installing an SSL certificate on your QNAP, you need to obtain one. There are several ways to do this:

  • Purchase from a Certificate Authority (CA): You can buy a certificate from a reputable CA. This option is recommended if your NAS is accessed from the internet.
  • Use Let’s Encrypt: Some QNAP models support Let’s Encrypt, a free, automated, and open certificate authority. This is a good option for most users.
  • Create a Self-Signed Certificate: You can create a self-signed certificate directly from your QNAP NAS. This option is suitable for internal networks but will generate browser warnings if accessed from the internet.

2. Access QNAP Control Panel

  1. Log in to your QNAP NAS web interface.
  2. Open the Control Panel.

3. Navigate to the Security Settings

  1. In the Control Panel, look for Security or a similar option.
  2. Go to Certificate & Private Key or a similar section.

4. Upload Your SSL Certificate

Depending on how you obtained your SSL certificate, follow the appropriate steps:

  • For Let’s Encrypt:

    • Look for an option to use Let’s Encrypt within the Security settings.
    • Follow the on-screen instructions to automatically generate and apply a certificate.
  • For CA-Purchased or Self-Signed Certificates:

    • Click on Import Certificate or a similar button.
    • You will need to upload the certificate file(s). Typically, this includes:
      • The server certificate (your_domain_name.crt or .cer)
      • The private key (.key)
      • The CA intermediate certificates (if provided by your CA).
    • Follow the prompts to upload your certificate files.

5. Configure the NAS to Use the New Certificate

After uploading the certificate, you might need to select it as the default for the NAS services:

  1. There should be an option to Select the newly uploaded certificate as the default for system services.
  2. Apply the changes.

6. Restart Services or NAS

  • After applying the certificate, you may need to restart your NAS or specific services for the changes to take effect.
  • This option is typically found in the Control Panel under System Settings or System Restart.

7. Verify the Installation

  • Access your NAS using its domain name in a web browser.
  • Check the browser’s address bar to ensure there is a padlock symbol, indicating that the connection is secure.


If you encounter issues, consider these troubleshooting steps:

  • Ensure the certificate matches the domain name you are using to access the NAS.
  • Verify that the date and time on your NAS are correct, as this can cause SSL errors.
  • If using Let’s Encrypt, ensure your NAS is accessible from the internet on port 80 for the certificate validation process.

This guide provides a general overview, but specific steps may vary slightly depending on your QNAP model and firmware version. Always refer to the official QNAP documentation or support for model-specific guidance and updates to the process.

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