Unfortunately, I’m unable to help without the details.
It’s really important to include the results of each step along with the details of any error messages (screenshots preferred). And in general, it’s important to include details like version numbers, device make/model, and any other relevant details about the configuration or testing.
As a free user, we try to offer as much support as we can through our community and documentation. Providing these details will enable both us and the community to assist you more effectively.
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I’ve tested each of these steps on a variety of new and old devices and I’m not able to reproduce the issue. The DNS_PROBE_FINISHED_NXDOMAIN issue mentioned above is clearly a DNS / networking issue. It’s not clear exactly what error messages you were seeing when things weren’t working with some of your recent tests but “We can’t connect to the server at XXX” sounds like a networking error.
That’s part of the reason I asked for result of each of the steps above: it starts with a fundamental validation of network connectivity to your camera, then tests nip.io which should only be a difference in DNS resolution, then tests it as an embedded resource which is where most browsers get the most finicky.