I have been testing and found out
When I push from Wowza to FMS, there is a little problem. The stream won't play, or stop start all the time. To solve the problem, I will have to restart the stream again (stop and start FMLE), then it will fix the problem. But after a while, the problem comes up again, so I will have to stop and start FMLE again.
This problem does not happen to wowza to wowza pushing. It only happens when pushing from Wowza to FMS.
Does anyone have any idea why?