NetworkDiscovery error - UNet Client Disconnect Error: Timeout UnityEngine

I am working on the simple NetworkDiscovery broadcast example
This is the broadcast script My net Manager :
View attachment 158294
Broadcast port : 47777
Network port : 7777
When I start the broadcast with the host client, the other clients are connected (connectivity successful) to the host client IP. But the packets are not being sent from the game port.
I keep getting this error message : " UNet Client Disconnect Error: Timeout...

NetworkDiscovery error - UNet Client Disconnect Error: Timeout UnityEngine