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slashdot.org loads slowly due to a.fsdn.com or DoH ?

  • 4 majibu
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  • Last reply by jonzn4SUSE

Timothy
Timothy
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During an initial visit to slashdot.org Firefox hangs for approx 45 seconds while the status bar says "looked up a.fsdn.com." Subsequent visits during the same browser session load promptly.

This is with Preferences -> General -> Network Settings -> Enable DNS over HTTPS -> Cloudfare or NextDNS. With Firefox DoH disabled the problem is not present. [Interesting side, the machine's systemwide DNS settings are configured for Cloudfare 1.1.1.1 ]

AFAIK all other sites load normally. I've been using the Firefox DOH for several months with only the above site as a problem.

Ideas?

Environment: Firefox desktop 106.x and 107.x macOS 10.13.6 The problem is present in "Troubleshoot Mode" when Firefox DOH is enabled.

During an initial visit to slashdot.org Firefox hangs for approx 45 seconds while the status bar says "looked up a.fsdn.com." Subsequent visits during the same browser session load promptly. This is with Preferences -> General -> Network Settings -> Enable DNS over HTTPS -> Cloudfare or NextDNS. With Firefox DoH disabled the problem is not present. [Interesting side, the machine's systemwide DNS settings are configured for Cloudfare 1.1.1.1 ] AFAIK all other sites load normally. I've been using the Firefox DOH for several months with only the above site as a problem. Ideas? Environment: Firefox desktop 106.x and 107.x macOS 10.13.6 The problem is present in "Troubleshoot Mode" when Firefox DOH is enabled.

All Replies (4)

jonzn4SUSE
jonzn4SUSE
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My DNS is also 1.1.1.1 and the site loads in under a second for me. see screenshot Let me also try my mac running 10.13.6 Are you on WiFi or plugged in?

jonzn4SUSE
jonzn4SUSE
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No issue for me on my mac. see screenshot I'm on WiFi.

Modified by jonzn4SUSE

Timothy
Timothy Mwenye swali
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jonzn4SUSE said
My DNS is also 1.1.1.1 and the site loads in under a second for me. see screenshot Let me also try my mac running 10.13.6 Are you on WiFi or plugged in?

Thanks for testing this. Are you using 1.1.1.1 via the Firefox native DoH settings? When I disable Firefox's native DoH and just use 1.1.1.1 systemwide the problem goes away. It happens even in a fresh Firefox profile. The issue doesn't happen in Chrome using its native DoH. I'm on WiFi.

jonzn4SUSE
jonzn4SUSE
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Yes, same setup.