I found the NetworkManager-l2tp bug report on github (https://github.com/nm-l2tp/NetworkManager-l2tp/issues/230) that helped me fix the problem. I disabled MPPE and only checked the MSCHAPV2 checkbox, now I can connect.
** Bug watch added: github.com/nm-l2tp/NetworkManager-l2tp/issues #230 https://github.com/nm-l2tp/NetworkManager-l2tp/issues/230 ** Attachment added: "Disable .jpg" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/2078529/+attachment/5811258/+files/Disable%20.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2078529 Title: L2TP/IPSec VPN stopped working after upgrade to Ubuntu 24.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/2078529/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
