Blue Iris

Using Blue Iris 5, I'm trying to get it to work on my Pixel 2 using the app. It was working the other day, then I updated my user's password (then updated the connection settings in the app via the QR code from the wizard) and it will no longer connect. I've looked over the settings, IPs, ports, username, password countless times.

If I use Firefox on my phone, I can connect to my Blue Iris server just fine (both LAN and WAN)--it's something about the app itself that won't connect. In the connection settings, I've tried using my IP address + port, and my DDNS + port. I do have HTTPS enabled via stunnel. I've stopped and restarted the service, etc.

When I look at the stunnel logs, when I connect using the app, I get the following error:
It seems like the Blue Iris app itself doesn't trust my certificate any longer. When I used Firefox on my phone, I had to tell Firefox to trust it...I don't appear to have that ability via the Blue Iris app.

Any suggestions?

I'm not 100% on this but I do recall there being a known issue (well it's understandable but a potential 'issue') regarding Android and untrusted certs. Since there's not really a way to force accept it like in Firefox, for the average user it's doing exactly what it should do.

That said, my setup is SLIGHTLY different than yours but fundamentally it's the same really. I do use a valid certificate using Let's Encrypt. It might be worth looking into using that to correct this, and honestly it does improve the security of it. I believe you just need a very lightweight agent on your server and some basic config steps but ultimately it's all free. The certs have a short life (3 months I recall?) but it auto-renews so no big deal.

The only real difference in my system and how yours sounds is that I have a WAF that is terminating the SSL connection and does the Let's Encrypt stuff for me. There should be no reason you can't just do it on your server directly though - I just don't have the experience to explicitly give you steps.

The need for certificates, etc, has been driving me bonkers, so I searched for a better solution. Use ZeroTier. It is free, and creates a VPN that interlinks PCs, phones, Teltonika RUT devices, whatever. It is absolutely brilliant. The only problem I have had is currently with Android 12 beta 4 that I installed on my phone, to discover that all VPN functionality in the beta is broken. But that's a Google problem that will be fixed.

Is there a solution to the error the OP asked about?

I just setup stunnel on Windows with a ZeroSSL certificatre and have no issues logging in via web browser. But I cannot login with the Blue Iris Android app of all things.