Unable to use webrtc when I run runheadless.webrtc.sh in remote headless container

I start the headless container with the following command:

./runheadless.webrtc.sh --no-window --allow-root --gpus all --rm --network=host nvcr.io/nvidia/isaac-sim:2022.1.0

and then access the url:

http://<ip address>:8211/streaming/webrtc-client?server=<ip address>

but the the browser shows a gray screen with nothing like this:

How can I solve this problem?

Additional information:
OS version: