Hello Michael,
Thank you for your message.
The issue might be caused by outdated security protocols (namely TLS 1.0 and TLS 1.1) which are no longer supported by the configuration server.
Before we can proceed to further troubleshooting, could you please try enabling TLS 1.2 support on your Viewer machine? In order to do so, please try following
this step-by-step guide on how to enable TLS 1.2 support.
Please let me know if the solution above did not help and the issue persists.