UDDesigner connectivity

When I try to use https://uddesigner.azurewebsites.net/home from a corporate network, I can’t add elements. When I click “Insert”, I get “Cannot send data if the connection is not in the “connected” state.” I presume this is due to a locked down corporate network? What specifically is the likely issue?

Tim Curwick

Usually that has to do with the web socket failing to connect. So i’m not sure what would be blocking that because it should just be going over port 80.