HTTP feedback for slot 3 can't be delivered

[Lora]

Hello
I just added 3 "Cisco Webex Room Kit Plus" to CUCM, TMS and TMS-XE.  Everything works fine, except that all 3 units showing the warning below:

WARNING: HTTP Feedback
The HTTP Feedback for slot 3 can not be delivered. There might be a problem with connectivity to the remote server.
•Url: https://192.168.1.3/tms/public/feedback/code/rcpto.org.ua
•Error: Couldn't connect to server

What would be the possible cause?  How do I isolate if it is network/firewall related or CUCM/TMS configuration related? 
Thank you

[Roger Kallberg]

Set the URL to use FQDN, not IP and possibly also set TLS verify to "Off" for HttpFeedback if you don't have a signed certificate for TMS and your VC devices has the chain of trust, aka the root and if applicable intermediate certificates(s) for the CA in their trust store.

You can look at the HttpFeedback configuration with this xcommand, xConfiguration HttpFeedback