This error is specific to Android version 4.4.2.  The root certificate on the device will need to be updated. If your device does not have a password or pin to lock the device please set a security code on the device prior to performing these steps.  

1. Access https://www.digicert.com/CACerts/DigiCertGlobalRootG2.crt on the device.
2. Click "Download" when prompted to download a file.
3. When prompted to name the certificate, keep the default values and select "OK."

The trusted certificate should now be installed. To confirm, go to Settings > Security >  Trusted Credentials (User tab).