[Bug 2040055] Re: systemd-resolved fails: Failed to start query: Invalid argument

[Matthias Nagel]

Unfortunately, increasing the log level to debug doesn't make any
difference. I already tried the approach with the drop-in configuration
file, but systemd-resolved doesn't log any additional information.

It is basically the same "non-reaction" as in
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2040051/comments/3.
Sorry, that I didn't mention that I already had tried to turn on
debugging in the first place.

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Title:
  systemd-resolved fails: Failed to start query: Invalid argument

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  # lsb_release -rd
  No LSB modules are available.
  Description:    Ubuntu 23.10
  Release:        23.10

  # aptitude show 'systemd-resolved'
  Package: systemd-resolved                
  Version: 253.5-1ubuntu6
  State: installed

  The system is unable to resolve any DNS names. Whenever a DNS name
  shall be resolved the following error appears in the journal

  Oct 21 15:50:32 my-host.my-domain.tld systemd-resolved[114]: Failed to
  start query: Invalid argument

  If one manually tries to resolve a DNS name from the local stub
  resolver via

  dig @127.0.0.53 A www.google.com.

  another error message is added to the journal. However, resolving a
  DNS name from the configured upstream DNS server works perfectly

  dig @81.169.163.106 A www.google.com.

  Returns a proper response. (Note, 81.169.163.106 is the internal DNS
  server from my hoster.)

  Some more infos

  # resolvectl 
  Global
           Protocols: -LLMNR mDNS=resolve -DNSOverTLS DNSSEC=no/unsupported
    resolv.conf mode: stub
  Current DNS Server: 81.169.163.106
         DNS Servers: 81.169.163.106 85.214.7.22
          DNS Domain: my-domain.tld

  Link 2 (venet0)
      Current Scopes: none
           Protocols: -DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

  
  # cat /etc/systemd/resolved.conf 

  [Resolve]
  DNS=81.169.163.106 85.214.7.22
  Domains=my-domain.tld

  
  # aptitude search '~i resolv'
  i   libnss-resolve              - nss module to resolve names via systemd-resolved                                                                        
  i A systemd-resolved            - systemd DNS resolver

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