How to Resolve the “Failed to Verify License. (1006)” Message After a KDS 2.0 Internet Update

1. Symptoms

KDS 2.0 / KDS 2.0 

• After the internet update is completed, clicking the Install button launches Smart Launcher and prompts for a license key.
• After the license key is entered, an authentication failure message is displayed during the verification process.

• The product installation is complete, but the license verification process cannot continue.

2. Root Cause

🟥 1) Incorrect tablet date/time settings (primary cause)

• The tablet's Date & Time setting is not configured to Automatic.
• The license verification process uses server time for validation.
  • Verification fails when the tablet time does not match the server time.

🟥 2) The license key itself is not the cause

• The format of the license key entered by the customer is valid.
• License verification was successfully completed with the same license key after correcting the settings.

▶ Overall Assessment

• Invalid license key ❌
• KDS 2.0 app defect ❌
• Server issue ❌
• Tablet Configuration Error ✔

3. Policy Decision

4. Final Resolution

✔ Enable automatic date and time settings on the tablet

• Settings path:

  Settings → General/General Management → Date and Time → Automatic Date and Time: On

✔ Restart the KDS 2.0 app and retry license verification

✔ Confirm that license verification is completed successfully

• The software upgrade can now proceed normally.