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 … (funda okungaphezulu)

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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Hi,

Today I got some problems with thunderbird. At first, when opening the program, it opens a new message that mentions "Provider for CalDAV & CardDAV: It's time to go" The message is not complete and has some drawing background I could initially still look at my mails but then tried to remove that mail and then the rogram crashed. I tried going into the accounts setting to update and that would also lead to crashing. I tried to set the troubleshoot mode off but it would crash before I can click to turn it off.

Any assistance would be great I use windows 11, 64 bits the thunderbird version is 128.5.2esr (32 bits)

Thanks a lot!

Vincent

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Sincerely

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