The use of http:// (rather than https:// ) in the URL is noteworthy and raises potential security concerns. While internal IMSS networks may have additional layers of encryption, a production-facing biometric system should ideally enforce HTTPS to prevent man-in-the-middle attacks during data transmission. This might be an oversight in documentation or an internal-only endpoint never exposed to the public internet. Regardless, proper implementation of biometric systems requires hashed and salted biometric templates, never raw images of fingerprints.
| Error Message | Likely Cause | Solution | | :--- | :--- | :--- | | | USB driver not installed or scanner not detected. | Reinstall the IMSS Biometric Reader software. Try a different USB port (preferably USB 2.0). | | "Huella no coincide con el patrón" | Fingerprint not matching the registered template. | Clean the scanner glass. Wash and dry your hands. Try a different finger (usually index or thumb). | | "Error de ActiveX / Componente no firmado" | Browser blocking the biometric control. | Add *.imss.gob.mx to Trusted Sites in Internet Options. Set security level to "Medium-low". | | "Sesión expirada - wfraccesousuario" | Workflow token timed out. | Close all browser tabs, clear cache (Settings > Privacy > Clear browsing data), and restart the process from Step 2. | | "Certificado no válido" | System date is incorrect or certificate revoked. | Check your computer’s date and time (must be Mexico City time). Update Windows. | The use of http:// (rather than https:// )
The web portal wfraccesousuario is designed for desktop browsers only. However, after registration, the IMSS Digital app on your phone will accept your phone's fingerprint sensor for login. Try a different USB port (preferably USB 2