Content Analysis version 18.104.22.168 introduced additional licensing checks which may result in the license being suspended under certain conditions.
This error will occur if either of the following are detected:
To resolve this issue, ensure Content Analysis can access the host validation.es.bluecoat.com either directly or using a proxy. If you're using a ProxySG appliance, please ensure SSL interception is disabled for this connection as Content Analysis may attempt to send a client certificate.
If you feel the serial number has not been used elsewhere and that this is in error, please contact support to discuss the options available.