Security Link reference code 500, message “Authorization Denied - Failed to Retrieve Secure Gateway Certificate”

This indicates there is a problem accessing authorization, possibly due to Wi-Fi and or server communication issues. 

Here are some things to check:

1. Check to ensure your AutoAuth account is in good standing and not expired.
2. Ensure your AutoAuth credentials are complete and accurate on the Device Management tab of your Technician Profile Manager,  Especially check the password, it must be identical.
3. Try to connect again at a later time.
4. Ensure you have a strong Wi-Fi connection on your diagnostic tool.
5. Try using a different known good network.
6. Move vehicle and diagnostic tool closer to router Tool may pass WiFi test and still not be close enough to router.