I've see something like this happening randomly in Firefox:
occasionally, loading a page fails and works on a retry.
Could be a Firefox specific issue though as I've not seen it
anywhere else.

On 4/16/21 10:49 AM, John Paul Adrian Glaubitz wrote:
> Hello!
>
> Does anyone else have issues with the reliability of DNS lookups on Tumbleweed?
>
> I'm regularly running into the issue that DNS lookups fail on the first attempt
> while they succeed on the second or third attempt. Multiple Debian machines on
> the same network don't have any DNS problems and lookups always succeed on the
> first attempt.
>
> I vaguely remember that there was a discussion regarding a long-standing DNS issue
> on openSUSE but I cannot find this thread anymore. Does anyone happen to remember
> the discussion?
>
> I considering to switch my machine to a different DNS resolver if the issue persists
> because it makes working with OBS very annoying as I'm often seeing this message
> when working on mass package updates:
>
> Failed to reach a server:
>   [Errno -2] Name or service not known
>
> Any suggestion for a quick fix or workaround would be appreciated.
>
> Thanks,
> Adrian