Everything of mine is external but I am accessing it using HTTPS.
I can use the UCP Device manager for Yealinks and grandstreams and both get that error. It doesn’t seem to actually do anything but it is annoying for customers and having to tell them to ignore the error that is in error.
Running the Freepbx Distro firewall and have all their recommended ports open to our IP addresses. Even when avoiding the firewall still get that error. My browser says there is a character missing/extra somewhere.