I try using the internet explorer app, but i just get an error message saying that the application is not supported.
I see it being done here:https://www.scirra.com/forum/xbox-360-039-internet-explorer-039-app-amp-html5_t74045, is there any reason why it wouldn't work now?
What webserver software are you running it on?
Develop games in your browser. Powerful, performant & highly capable.
Consoles are usually locked down for security reasons, so they may well have turned off browsing sites on the LAN.
Construct 2 never really supported the Xbox 360 anyway. Xbox One is supported though!