Tanks for your reply RvSeok!
you talking about Livelink Preset right? i already had set up preset and livelink works fine even after restart from Epic Games Launcher.
I can pretty sure It’s not about Livelink Preset
the problem happen when i launch the project through Switchboard
even if it’s exactly the same project, Livelink Data is not streamed with switchboard
and i found the answer
you should type IP address to switchhboard’s settings → Unicast Endpoint
even if you using only local machine.
I think It is Engine’s bug
This happen only UE 4.27.2 and 5.0.2
5.03 is working fine without typing Unicast Endpoint
but still 4.27 is not updating now i hope this will fix in a future