Tuesday, September 12, 2023

Firefox DNS over HTTPS and "connection timed out"

I noticed on I site I use a lot suddenly images were not loading properly.  This happens sometimes with this site so I did not think much about it.  But then I notice no other users are complaining about it, and notice the images load ok in Chromium.

I double checked about:networking in Firefox and notice it's trying to do the IPv4 lookup , which fails.  But Chromium does the IPv6 lookup, which worked.

After I turned off DNS over HTTPS and restart Firefox it worked ok.  Before restarting Firefox it did not work.

Settings > Privacy & Security (scroll to bottom)

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