Hi @Rookie_Chris,
Cesium for Unreal uses Unreal Engine’s FHttpModule to do HTTP requests. It looks like that does have proxy support, accessible from the C++ API. See SetProxyAddress:
I was surprised it doesn’t appear to be configurable in an .ini file or anything like that, though.
If your connection requires a proxy, I would expect tile requests to fail, too. When you open the Samples project, do you get a globe at all? Or maybe your network requires a proxy for POST requests but not GET requests?
If you’re up for it, you can try editing UnrealAssetAccessor.cpp to set the proxy address prior to the httpModule.CreateRequest call in UnrealAssetAccessor::post, and see if that helps.
Kevin