Web traffic quota limit should operate on active connections
Sophos XG unable to terminate live sessions when user network traffic quota ends.
For example; When we download the file via HTTP protocol, the connection cannot be terminated until it pauses the download process or the download is finished, so user can transfer as much as he wants from the open session. Depending on when the session is closed.
Its very important for paid internet service providers. (If provider provides via satellite connection, costs calculating as per MB)
Goker Sivrikaya commented
Having same issue and that is crucial problem to be solved out.