web viewer 2.0

I produced a mesh cesium 3D tiles and tick "Generate ContextCapture Web Viewer 2.0 application2" and after uploaded on my server company everithing is working good.

I gave the complete folder (with App_CCWebViewer2 and Scene folders) to our customer but after he uploaded on his server it doesn't work.

The costumer is a government agency so I don't know if there is some firewall or something like that could block everithings....is there some server specification/settings to check?

Any suggestion?