I compressed the video. But you can see the time delay connecting to myti99. The config system says I am authenticated. But it times out. I am based in the Netherlands and have 139ms pings from my laptop (did not test the pings from the PI). Next weekend I have more time to troubleshoot.VID_20190120_181547_428x240.mp4
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I have ruled out the problem being with your credentials and I am able to log in on my TI as you without a problem. I have added some more debug logging to the backend that will hopefully shine a light on the problem.
It may be something is corrupt in the cached files on your Pi and I'd suggest clearing them out.
Can you log into your tipi as user: tipi and delete everything in the ~/.tipivars directory?
ssh tipi@<your PI's IP address>
rm -f .tipivars/*
This will reset the state and history of all your myti99.com programs, and should help. Can you try again and let me know when you do? If it doesn't work, I can check the server logs and take it from there.