From: Doug@hyperspace.vogon.gov   
      
   Carlos E. R. wrote:   
   > On 24/07/2021 22.42, Andrew wrote:   
   >> Carlos E. R. wrote:   
   >>> On 24/07/2021 12.44, Andrew wrote:   
   >>>> One of my computers is refusing to update, zypper says it cannot resolve   
   >>>> download.opensuse.org.  The problem was first seen around 14 hours ago   
   >>>> and an update had succeeded 48 hours before that.   
   >>>> It is the only system I have which uses Network Manager, it is also ipv4   
   >>>> only (hardware reasons) although in that respect it is not the only one.   
   >>>>    Other xxx.opensuse.org sites *are* accessible to it.   
   >>>>   
   >>>> I will have more time to attack this problem tomorrow, this query is   
   >>>> just on the off-chance that someone else has seen this.   
   >>>> My suspicion was name-resolution on the router - I set up DNS over TLS   
   >>>> (DoT) recently with the primary server being dns.quad9.net - but things   
   >>>> still worked for 48 hours after I made that change.   
   >>>>   
   >>>> OpenSUSE 15.3 Leap, fully patched.   
   >>>   
   >>> Sometimes it is not download.opensuse.org which doesn't resolve, but the   
   >>> mirror that you get redirected to. It is not easy to find out.   
   >>>   
   >>> Another typical problem would be trying to use https instead of http.   
   >>>   
   >>>   
   >>> You will have to diagnose. Start with:   
   >>>   
   >>> host -v download.opensuse.org   
   >>>   
   >>> in the problem computer.   
   >>>   
   >>   
   >> Host download.opensuse.org not found: 2(SERVFAIL)   
   >> Received 39 bytes from (an-ipv6-address)#53 in 0 ms   
   >   
   > I said "host -v ..." - you removed the -v.   
   >   
   >   
      
   No, I just checked (bash history, of course) and the "-v" was definitely   
   in there.   
   There has been a change for the worse though, I'm now getting   
      
   ; connection timed out; no servers could be reached   
      
   This is both with and without "sudo", my tests last night were without.   
      
   Meanwhile Firefox is finding whatever it wants with no problems at all.   
   This gave me another idea, I appended #80 to the host name and it is   
   finding the host.  Back to the router configuration.   
      
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