Ok
That should work, assuming your cameras have H264 encoded streams, and your connection has sufficient bandwidth to stream all three simultaneously.
Note that in BlueOS
Generally if pinging works then the web interface also works (for both Companion and BlueOS), so that’s unusual.
It’s perhaps worth noting that the BlueOS interface uses different pages and ports to the Companion one - default connection to the BlueOS interface should be at http://192.168.2.2 or http://blueos.local (no extra port or page/route specifiers).
Also, are you certain the IP you’ve set is for the connection to the vehicle? If you pull out the vehicle connection while looking at the available networks the one you’re after should change to showing as disconnected and/or should disappear.
If it’s pinging back then it’s unlikely to be an issue with the onboard computer, although you can ssh in to check if you want. User is pi, and the default password is companion on Companion and raspberry on BlueOS.
Are you able to try a different topside computer? Others have had antivirus issues, and occasionally just unknown problems with a particular device.