F33 ipsec l2tp libreswan 4.1 and older Gateways

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i’ve had a very similar problem, my company is using a cisco firewall as l2tp/ipsec server with weak ciphers. Libreswan dropped the support. I’ve had replaced libreswan with strongswan. Before do so, remove your cipher config in your NM Configuration. After installing, establish a connection, it will usually auto-detect useable ciphers, DH Groups, ans so on … Of course, you can use your preferred ciphers as well. See the strongswan Wiki for more information.

Hope, this helps you out.

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