See "Issue with VPN servers only proposing IPsec IKEv1 weak legacy algorithms" in the README.md file:
https://github.com/nm-l2tp/network-manager-l2tp/blob/nm-1-2/README.md I can confirm with the ike-scan.sh script mentioned in the README.md file that the VPN server you are trying to connect to only provides proposals that the newer version of strongSwan now considers weak. If you can modify the VPN servers settings, the current strongest proposal it provides contain modp1536, but it needs to be at least mod2048. Otherwise, you can specify IPsec phase 1 and phase 2 algorithms in the IPsec Options dialog box: - Phase1 Algorithms : aes256-sha1-modp1536 - Phase2 Algorithms : aes256-sha1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771223 Title: Cannot connect to L2TP network To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-l2tp/+bug/1771223/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
