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With my laptop running an arch-linux I can not access some websites when I am at home like for example:

But I can access those websites from university as well as from my parents' place.

There are some websites that I can access from home like for example:

This is independent of whether I use Qutebrowser or Firefox.

An old debian system installed as dual boot on the same laptop is able to access all of those websites from home.

When I am trying to access a not working website Firefox says:

Hmm. We’re having trouble finding that site.

We can’t connect to the server at www.leo.org. If that address is correct, here are three other things you can try:

  • Try again later.

I have done that plenty of times.

  • Check your network connection.

I am connected and I have an ip address.

  • If you are connected but behind a firewall, check that Firefox has permission to access the Web.

I am able to access other webpages and why should a firewall forbid wikipedia but allow youtube?

I am able to ping those webpages from my arch system via ip but not via url. Therefore I am assuming a DNS problem.

According to dig my DNS server is my router, which is the same for another debian system in the same network where everything is running fine.

I am using systemd-resolved.

I am lost how to debug this further. Why does it work elsewhere but not at home? Why does it work on other systems in the same network but not on my arch linux?

closed as too broad by Rui F Ribeiro, RalfFriedl, schily, JigglyNaga, icarus Oct 25 '18 at 3:38

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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I suggest you check file /etc/nsswitch.conf. It is name service switch configuration file. Param. host in this file shows you sources which systemd-resolved uses for getting host by name.

  • that's it. /etc/nsswitch.conf contained hosts: files mymachines myhostname resolve [!UNAVAIL=return] dns after removing the [!UNAVAIL=return] it works. Thank you very much. Just out of curiosity, do you know the reasoning why it was in there? My debian system has a [NOTFOUND=return] instead. If I insert that on my arch linux I can not access those pages again. – jakun Oct 23 '18 at 17:28

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