Please provide debug-level logs from systemd-resolved.service from a
time where this issue is observed. You can enable debug-level logging
like this:
$ mkdir -p /etc/systemd/system/systemd-resolved.service.d/
$ cat > /etc/systemd/system/systemd-resolved.service.d/debug.conf << EOF
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug
EOF
$ systemctl daemon-reload
$ systemctl restart systemd-resolved.service (or reboot if you prefer).
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2040055
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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