Connection to Cesium ion fails

[A.Hardy]

Hello,
We have been struggling with a new issue recently. For some reason we are unable to connect the the ion servers from unreal. We see the following message in the output log when clicking on the “Connect to Cesium ion” button, and the browser does not launch to perform the oauth2 / token selection process

Any suggestion to help us solve this problem ?

[janine]

Hi @A.Hardy, welcome to the community!

Is this still an issue for you? If so, could you please answer the questions below so we can best support you?

1. Are you accessing Cesium ion through a VPN?
2. Which country are you trying to access Cesium ion from?
3. What OS and Browser are you using to load the oauth endpoint on Cesium ion?

Thanks!

[A.Hardy]

Hi, thanks for taking my points.
We still have the issue here are the answers to the requested points :

• We are trying to access cesium through ZScaler client connector (Zscaler Client Connector | Platform), from inside or outside our corporate network. We did try to connect to cesium ion with zscaler enabled and disabled, and each time it failed. I can mention that I tried to access cesium ion from home office, and from my personnal computer it works but not from my corporate computer. We are trying to figure what we need to change in our infrastructure to make it work. From our zscaler team, everything is open on their side.

• We are trying to connect from France

• we have been experiencing the issue with windows 10 and 11, and with browsers Chrome and firefox as default browsers for the oauth endpoint.

Thanks for helping us tracking that issue.

[Kevin_Ring]

Hi @A.Hardy,

That’s a strange error, and we’re not sure what to make of it.

It’s a bit of a long shot, but you might try following the instructions here on the problematic machine and see if it helps:

KNOWN ISSUE: Tilesets not loading in packaged Unreal apps

I’m slowing learning a bit more here… From what I can gather piecing together information from various non-authoritative sources, Windows has a mechanism where it automatically downloads new certificate authority certificates from Windows Update on-the-fly as they’re needed. However, it can only do this for applications that use the “proper” Windows APIs to manage certificates. Presumably, this does not include Unreal Engine. Therefore, if you’re running on a system where the “Starfield Servic…

Another possibility is that you network and/or Zscaler requires an HTTP proxy, particularly for POST requests. Unreal Engine does not automatically use the proxy configured for Windows. If this is the problem, some users have been able to solve it as described here:

Error connecting Cesium to Unreal

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 r…