Error trying to run EchoTest

Hello ,
I just installed janus on a debian 11 server and i can’t run the Echo Test succefully , i didnt get any error but i have that :
ICE state changed to checking
Remote description accepted!
ICE state changed to connected
End of candidates.
Janus says our WebRTC PeerConnection is down now
with chrome://webrtc-internals i saw that :


My janus info here :
but i can’t find a solution
Could you help me please ?
thanks for any advise