TCP connection failure (-6)

My camera supports V380 app. When I connect to watch it in my pc (win 10) appears an indication “TCP connection failure (-6)”. Can please someone advise me what to do?

I may have a similar camera - cheap little PTZ with a tinny speaker, that says “Connecting to wireless network…internet connected!” when powering on?
Try this string:
Substitute your own IP, obviously.