[strongSwan] Sudden issues with Windows 10 clients

[Tobias Brunner]

Hi Jafar,

>      No need to configure a prf, it is already assumed when you
> configured a DH group; so you can drop prfsha256.

Small correction, the PRF algorithm, if not configured explicitly, is
not derived from the DH group, but the integrity algorithm, in this case
sha256.

Regards,
Tobias