Possible issue with WHMCS client area and Generic rules

Long story short, best I can tell something in the Generic rules is causing issues when clients login or logout of WHMCS (https) .

NOT all clients.

IS intermittent with the clients it does affect. 6 or so refreshes and the page will load.

The reported error message is[/s]

Secure Connection Failed An error occurred during a connection to secure.bezazz.com. SSL peer rejected a handshake message for unacceptable content. (Error code: ssl_error_illegal_parameter_alert)

Thing is nothing shows up in any logs but disabling the Generic rules so far appears to have stopped it from occurring.[/s]

It has occurred again with Generic off.
So please ignore the above.