This articles describes possible causes for UTM to show all statistics in zero under "show security utm web-filtering statistics".
If KB25680 [juniper.net] has already been checked; and issue persists, please refer to Functional Requirements for Enhanced Web Filtering, and make sure the requirements are met.
For Enhanced Web Filtering, it is necessary to download and install an AppID signature package for UTM to work correctly. From the link above:
"TCP connection between a Web client and a webserver—An application identification (APPID) module is used to identify an HTTP connection. The EWF solution identifies an HTTP connection after the device receives the first SYN packet. If an HTTP request has to be blocked, EWF sends a block message from the device to the Web client. EWF further sends a TCP FIN request to the client and a TCP reset (RST) to the server to disable the connection. The device sends all the messages through the flow session. The messages follow the entire service chain."
The following commands can be used to download and install AppID:
user@hostname> request services application-identification download
user@hostname> request services application-identification install Lastly, verify the version installed using:
user@hostname> show services application-identification version