Created attachment 1372402 [details] The NetworkManager output obtained from journalctl Description of problem: Fedora recently upgraded the kernel to version 4.14. I have a VPN L2TP/IPsec that stopped working after the upgrade. If I choose a kernel 4.13 it works Version-Release number of selected component (if applicable): The kernel (uname -a): Linux merlino 4.14.8-300.fc27.x86_64 #1 SMP Wed Dec 20 19:00:18 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux NetworkManager-l2tp.x86_64 1.2.8-3.fc27 @fedora NetworkManager-l2tp-gnome.x86_64 1.2.8-3.fc27 @fedora xl2tpd.x86_64 1.3.8-5.fc27 @fedora How reproducible: It happens all the time with 4.14.x kernels Additional info: In attachment the output of journalctl -u NetworkManager --since today with the NetworkManager output with some personal info obfuscated.
Keep an eye on this netdev linux kernel mailing list thread : https://patchwork.ozlabs.org/patch/838470/ It has info on the kernel 4.14 commit that broke IPsec transport mode when a wildcard address is used on the client side like what NetworkManager-l2tp does. *** This bug has been marked as a duplicate of bug 1526203 ***