Lars,

> esp=3des-sha1,3des-sha1-modp1024

If you have both non-PFS (3des-sha1) and PFS (3des-sha1-modp1024)
proposals included, strongSwan includes a KE payload for the DH
exchange. The responder is free to ignore the KE payload if it picks the
non-PFS proposal, but it seems that this does not work that well with
Windows.

> It was a bit tricky to get this right, as it is not obvious if PFS is
> enabled or not.

To make sure no PFS is in use, you should try to be more explicit, for
example by using

>   esp=3des-sha1!

as the proposal.

Regards
Martin

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