If there is a parsing issue (for example, if the domain name contains incorrect syntax), the GAM engine reports the 14005 error in the MWG log. If there is an error with the URL, Web Gateway returns the 14005 error to the user with a block page.

Also, starting with GAM engine 2014 the scanning behavior has been changed. Global Threat Intelligence (GTI) cloud lookups are critical to GAM engine for establishing context that allows it to classify files accurately and to reduce the risk of false positives. For more details and for instructions to enable GTI cloud lookups, see:
KB85830 - Increase in missing detections or a higher rate of false positives, after disabling GTI cloud lookup in Web Gateway.