On Wed, 31 Jan 2018, Amir Naftali wrote:

Subject: Re: [Swan] meaning of error code ->
    ENCAPSULATION_MODE_UDP_TUNNEL_DRAFTS

just saw it again, we're running libreswan 3.16 on ubuntu and we get the 
following message  #484:
ENCAPSULATION_MODE_UDP_TUNNEL_DRAFTS must only be used with old IETF drafts
#484: sending encrypted notification BAD_PROPOSAL_SYNTAX to X.X.X.X:4500 

Because of the old version you are using, you are missing this commit:

https://github.com/libreswan/libreswan/commit/f1c2e586c33da8928294f5e55ccdbc16fece7e5e

This fix was introduced in libreswan 3.19.

Paul
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