So, your VPN provider is serving incorrect DNS information. That's not a bug in resolvconf.
Also, your bug report shows that you are using Ubuntu 20.04 LTS. resolvconf has been deprecated in Ubuntu 20.04 LTS in favor of systemd- resolved. ** Changed in: resolvconf (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to resolvconf in Ubuntu. https://bugs.launchpad.net/bugs/1926143 Title: DNS resolution faulty over openconnect Status in resolvconf package in Ubuntu: Invalid Bug description: When connected over VPN, then some domain names are incorrectly resolved. In particular HTTPS/SSL is not working for many sites. Steps to reproduce: 1) Connect to a vpn via openconnect 2) Lookup an address: nslookup www.bing.com Server: 127.0.0.1 Address: 127.0.0.1#53 Non-authoritative answer: Name: www.bing.com Address: 145.253.3.148 Name: www.bing.com Address: 2a01:860:0:210::1:0 Which is wrong. Whois shows that this is actually an address of a backbone server used by my provider. Workaround: 3) Deactivate automatic updates to resolv.conf with sudo dpkg-reconfigure resolvconf 4) Add the line: nameserver 8.8.8.8 to /etc/resolvconf/resolv.conf.d/head 5) run sudo resolvconf -u 6) Verify DNS resolution: nslookup www.bing.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: www.bing.com canonical name = a-0001.a-afdentry.net.trafficmanager.net. a-0001.a-afdentry.net.trafficmanager.net canonical name = www-bing-com.dual-a-0001.a-msedge.net. www-bing-com.dual-a-0001.a-msedge.net canonical name = dual-a-0001.a-msedge.net. Name: dual-a-0001.a-msedge.net Address: 204.79.197.200 Name: dual-a-0001.a-msedge.net Address: 13.107.21.200 Name: dual-a-0001.a-msedge.net Address: 2620:1ec:c11::200 Which returns the correct ip address. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: resolvconf 1.82 Uname: Linux 5.8.0-050800-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.16 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Apr 26 11:21:43 2021 InstallationDate: Installed on 2015-11-05 (1999 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) PackageArchitecture: all SourcePackage: resolvconf UpgradeStatus: Upgraded to focal on 2020-09-10 (228 days ago) modified.conffile..etc.apport.crashdb.conf: [modified] mtime.conffile..etc.apport.crashdb.conf: 2019-03-07T14:28:39.455024 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/resolvconf/+bug/1926143/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp