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DNS over HTTPS
Hello everyone,
recently we noticed that Teams is making direct DNS requests over HTTPs (DoH) to 8.8.4.4 or 8.8.8.8. Unfortunately I cannot find any documentation that supports this activity. According to MS documentation Teams should be using the Internet settings as defined in the browser which is not what we've noticed. Also the machine from where I noticed this anomaly doesn't have DoH configured in Windows 10. This is not just one machine that was observed performing such activity.
Has anyone noticed similar behavior ? also could someone shed some light why this is not documented ?
Teams versions
1.5.00.28567
1.5.00.28361
- I've not looked personally, but as Teams is running inside a Chromium browser (Electron essentially), it is probably picking up some of the stuff from that. I don't think you can change the settings in Electron for security reasons. If you're inclined to check, you could enable dev mode and see if any of the dev settings windows let you get to the Chrome settings. Left click the Teams icon in the system several times, then right click and you'll get extra options.
3 Replies
- Necro posting, but information seems sparse on the subject. We've seen the same unwanted behavior - having disabled DoH across the board while observing Teams happily ignore the policy. We do not see the same with New Teams (2.1), though.
- I suspect that's probably because unlike "old" Teams, which is Electron based, "New" Teams is not, so it's most likely going to respect your OS settings. There's some interesting notes on architecture here https://techcommunity.microsoft.com/t5/microsoft-teams-blog/microsoft-teams-advantages-of-the-new-architecture/ba-p/3775704
With "old" Teams being Electron, you might be able to force dev mode and go into the settings and toggle it off. I've not checked if that's possible though.
- I've not looked personally, but as Teams is running inside a Chromium browser (Electron essentially), it is probably picking up some of the stuff from that. I don't think you can change the settings in Electron for security reasons. If you're inclined to check, you could enable dev mode and see if any of the dev settings windows let you get to the Chrome settings. Left click the Teams icon in the system several times, then right click and you'll get extra options.
