VDAs are showing as unregistered in the Studio Console, VDA event log show below error:

Test call from Cloud Connector to VDA failed.

Remove all unnecessary iplisten addresses to fix this the issue.

1. Run below command to verfiy iplisten parameter is configured correctly:

netsh http show iplisten 

2. Run below command to remove incorrect iplisten configuration.

netsh http delete iplisten ipaddress=<incorrect iplisten IP Addess>

Here's an example to remove "::" from iplisten.

netsh http delete iplisten ipaddress=::

Problem Cause

"::" has been configured into netsh http iplisten, port 80 is NOT listening on VDA server.

 As the result, Connector is not able to connect with VDA server on port 80, hence VDA registration failed with RejectionCode='Test call from Cloud Connector to VDA failed.'