TCP KeepAlive - Avoid long client connection without data

I can't test unfortunately but as you are using OneConnect (and perhaps even if not) surely all the client-side connections are not duplicated server-side? What TCP profile is used server-side? Does the keepalive keep the server-side connection open also? I doubt it. If you could test/check that would be great. If it doesn't we could use the SERVER_CLOSED iRule event to terminate the client-side connection but possibly we'll have to disable OneConnect to use if effectively.