ASUS Router Error Code 19: How to Fix It

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
19
Brand
ASUS Router
Product Type
networking
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Error Code 19 on your ASUS router indicates that the Trend Micro signature license for AiProtection has expired. This license is required for real-time threat protection and parental controls. Without renewal, your router's security features are disabled.
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Tools You'll Need

How to Fix Error Code 19

  1. Check your current firmware and AiProtection status

  2. Update the Trend Micro signature database manually

    Do not power off the router during the update.

  3. Renew the Trend Micro license

    Renewal requires a valid payment method and may incur a fee.

  4. Factory reset the router (if license renewal fails)

    A factory reset will erase all your custom settings. Backup your configuration first under Administration > Restore/Save/Upload Setting.

  5. Contact ASUS support or disable AiProtection

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When to Call a Professional

If the license renewal fails and a factory reset does not resolve the error, contact ASUS support. Also call if you suspect a hardware issue (though rare for this error).

Frequently Asked Questions

Does Error 19 affect internet connectivity?
No, your internet connection should still work. Error 19 only disables AiProtection security features like parental controls and malware blocking.
How do I check if my Trend Micro license is still active?
Log into your router and navigate to AiProtection. The status page will show the license expiration date and whether it is active or expired.
Can I use a third-party antivirus instead?
AiProtection is built into the router. You cannot replace it with another service, but you can disable it and rely on endpoint security on your devices.
Will updating the firmware fix Error 19?
Sometimes. Ensure your firmware is up to date. If the license is actually expired, updating firmware alone won't fix it; you need to renew the license.
How much does it cost to renew Trend Micro license?
The cost varies by model and region. Check the ASUS website or your router's license management page for current pricing.

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