Connections to contextapi.telerik.com fail when the client computer is behind a proxy. The observed error is:

Using ContextApi URL: https://contextapi.telerik.com:443
Found license evidence with userId.
gRPC error in ValidateUserLicenseAsync: Unavailable - Error connecting to subchannel.
Unhandled exception. Grpc.Core.RpcException: Status(StatusCode="Unavailable", ...)
   at Grpc.Net.Client.Balancer.Internal.SocketConnectivitySubchannelTransport.TryConnectAsync
   at ContextAPI.ValidateUserLicenseAsync(CancellationToken ct)
   at Program.<Main>$(String[] args)
 ---> System.Net.Sockets.SocketException (10060)