I found other posts on use-ip.com complaining about this certificate issue after upgrading from firmware v4 to v5, so it's some new problem Hikvision is trying to create (although the other guy had a HIKVISION doorbell camera with this problem).
I'm the "other guy" that was "complaining".
I finally got the non-Hik EZ-Viz DB1C to connect to my M-series NVR... I noticed the latest M-series software asks user to input region after loading... that may be what changed.
I notice that the non-Hikvision device uses port 8443 instead of 8000? I don't know why... the other doorbell I have is Hikvision DS-HD2 (it's exactly the same as DB1C just Hikvision branded):
I think you should try the HIKVISION protocol with port 8443?
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