Host name resolution fails on Fedora 39 system

One of my Fedora systems will often fail to do DNS resolution. Both ping host.ext and nslookup host.ext fail. When I edit /etc/resolv.conf to use nameserver 1.1.1.1 instead of nameserver 127.0.0.53, nslookup works, but ping still fails. Why is the runtime library not using the nameserver listed in /etc/resolv.conf? /etc/nsswitch.conf contains # Generated by authselect # Do not modify this file manually, use authselect instead. Any user changes will be overwritten. # You can stop authselect from managing your configuration by calling 'authselect opt-out'. # See authselect(8) for more details. # In order of likelihood of use to accelerate lookup. passwd: files sss systemd shadow: files group: files sss systemd hosts: files myhostname resolve [!UNAVAIL=return] dns services: files sss netgroup: files sss automount: files sss aliases: files ethers: files gshadow: files networks: files dns protocols: files publickey: files rpc: files How do I fix that? How do I persuade the local named to forward its requests to an external name server? Linux has acquired all these little "helpful" modules, but it seems to me they just obfuscate situations such as these.