I worked the Service Request with Ram. When you set up a connection, the server name in the url needs to be in Fully Qualified form rather than short hand NetBIOS name.
Another aspect to this is that if the server is behind a NAT connection, traffic is unavailable to other hosts. On my test server, I can view the project folders and download, however from any other machine I get the same error message.
Install and Configure Web Services Gateway / CORS
Install and Configure Web Services Gateway
Bentley Web Services Gateway and the ProjectWise plug-in are delivered with ProjectWise Design Integration Server (ProjectWise Server Setups). You can install them all on the same computer at the same time you are installing ProjectWise Design Integration Server, or you can install Bentley Web Services Gateway and the ProjectWise plug-in together on a separate computer.
For this service
Enter this URL
ProjectWise Web View
integrated Office for the web
PDF Markup Service
https://projectshareportal.bentley.com/ (needs to be added for Webview to work)
6. Deploy Bentley Web Services Gateway and the ProjectWise plug-in to your secure website.
Here are diagrams of how access is controlled: Here’s the link to the PowerPoint version with animations.