The green “Online” Icon at the top right, is an indication that the GRIDlink is connected with GRIDview
The yellow “Connection Failure -1” in the Alarm group is one of several comm error codes that indicate the GRIDlink has not connected to the Open ADR Virtual Top Node (VTN)
The GRIDlink should always connect to GRIDview regardless of it ability to connect to the VTN (as shown here). Check alarm codes.
About Comm Error Codes …