Reproducible slow (30 seconds) DNS resolution on Ubuntu 24.04

I use Firefox 134.0.2 (64-bit) on Ubuntu 24.04. Some (not all) web sites show up only after a delay of exactly 30 seconds. The attached screenshot shows that this delay … (read more)

I use Firefox 134.0.2 (64-bit) on Ubuntu 24.04.

Some (not all) web sites show up only after a delay of exactly 30 seconds. The attached screenshot shows that this delay is due to DNS resolution. This behavior is reproducible by simply closing Firefox, opening it again and entering the same web site once more. Once this initial delay of 30 seconds for DNS resolving has passed the web site can be browsed normally.

Using Google Chrome, Opera or even the Tor Browser on the same system works without any significant delay. Also a DNS lookup from the console returns data almost immediately.

As the delay is always exactly 30 seconds this looks like some DNS resolver timeout only showing up when using Firefox.

Neither starting Firefox in Troubleshoot Mode nor (as often suggested) disabling IPV6 for DNS by setting network.dns.disableIPv6 to true did help.

Any idea how to fix this 30 seconds delay?

Many thanks for any help, Felix

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My license no is : [edited]


Thank you for purchasing the DownloadHelper Video Conversion License for Firefox.

Your personal registration code is: [edited]

If you purchased this license from the browser you intend to use it on, it should already be registered and you should be able to use the product immediately.

Otherwise, or if you want to reinstall your license in your browser, visit that link: https://www.downloadhelper.net/register.php?license= [edited]

You can also use Video DownloadHelper settings: https://github.com/aclap-dev/video-downloadhelper/wiki/V9-interface#validate-your-license-key

You can access your invoice at https://www.downloadhelper.net/show-invoice?invoice= [edited] Best regards,

The DownloadHelper Team

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