Question about unity transport instruction

I just followed the “Create a simple client and server” section from official instruction of unity transport 2.0.2.

The “ServerBehaviour” and “ClientBehaviour” scripts worked well in One scene.

But when I put the scripts in separated scenes ,build and run the application, the “ClientBehaviour” script can not connected to the “ServerBehaviour” .

I shutted the fire wall ,it not worked either.

why this happened? Did i missed anything?

Are your two scenes loaded simultaneously? Also, have you confirmed that the two drivers are both created? You can add logs in the Start and OnDestroy methods of your two scripts to track that.