Web server don't connect on ubuntu

I've tested my OpenImu300ZI with the web server on windows and it worked great.
Now I moved to ubuntu and I can't get the web interface to connect to the server. My server is able to connect with the device, and also in cli mode recording is working great. The IP and port is OK (127.0.0.1:8000)

First ,please make sure the web browser is Google Chrome ,then refresh the web server.If it dosen't work ,try to restart the system,please.

Thank you very much!!
Actually, my browser is Firefox.
After switching to Chrome it is working perfectly

You are welcome.