I simply cannot figure out how to make a signalr connection from Angular.
Using the following tutorial at https://docs.microsoft.com/en-us/aspnet/signalr/overview/gettin
Are you sure that the hubEndpoint is correct? It seems like the hub is part of the angular routing (judging by the way you are writing it). Try to set the full path (ex. https://www.myapp.com/SynBroadcastHub/BroadcastMessage)