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Firefox debian - server not found only for some addresses but ok with other browsers

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tr6
tr6
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Hi all,

Machine under debian testing, updated today.

I have a strange behavior from my firefox, some websites, and only a few, can't load correctly. IE with linkedin, the page is displayed without CSS and almost no content. In the firefox console I have 

   Loading failed for the <script> with source “https://static-exp1.licdn.com/sc/h/bpob6bbc8gauqn4cct96xaqpf”. www.linkedin.com:1932:1
   Loading failed for the <script> with source “https://static-exp1.licdn.com/sc/h/efncoxjdl37tofw662sg013tp”.

And the fact, when I try loading one of those addresses, I have a "Server not found".

Everything is working fine under chrome or even Tor (which is in the end a modified firefox). 

   dig static-exp1.licdn.com

is returning correct entries my DNS configuration is correct (tried with multiple servers) I have nothing in my host file and no firewall/security rules/softwares in place

This problem occurs with firefox ESR installed from debian repositories and firefox downloaded from mozilla website. No add-ons installed.

I already tried removing my whole firefox config/profile and fresh reinstall without any add-ons

Tried also to disable DNS prefetch and IPV6 in firefox config.

Timezone date/time is configured correctly and sync with NTP

Thanks if you have any tips to sort this out.


EDIT 1: When activating DNS over HTTPS in config, everything works fine then. But then why this behavior only with a few addresses?

Hi all, Machine under debian testing, updated today. I have a strange behavior from my firefox, some websites, and only a few, can't load correctly. IE with linkedin, the page is displayed without CSS and almost no content. In the firefox console I have Loading failed for the <script> with source “https://static-exp1.licdn.com/sc/h/bpob6bbc8gauqn4cct96xaqpf”. www.linkedin.com:1932:1 Loading failed for the <script> with source “https://static-exp1.licdn.com/sc/h/efncoxjdl37tofw662sg013tp”. And the fact, when I try loading one of those addresses, I have a "Server not found". Everything is working fine under chrome or even Tor (which is in the end a modified firefox). dig static-exp1.licdn.com is returning correct entries my DNS configuration is correct (tried with multiple servers) I have nothing in my host file and no firewall/security rules/softwares in place This problem occurs with firefox ESR installed from debian repositories and firefox downloaded from mozilla website. No add-ons installed. I already tried removing my whole firefox config/profile and fresh reinstall without any add-ons Tried also to disable DNS prefetch and IPV6 in firefox config. Timezone date/time is configured correctly and sync with NTP Thanks if you have any tips to sort this out. '''EDIT 1: '''When activating DNS over HTTPS in config, everything works fine then. But then why this behavior only with a few addresses?

Modified by tr6