[strongSwan] Upgrade client to 5.6.3, get AUTH_FAILED

[Hoggins!]

Hello,

I bumped into a strange problem and I was wondering if you could help me :

Sun is my StrongSWAN "server" (concentrator), and has been running
StrongSWAN 5.6.3 for a few days, no problem.
Its "clients" have various StrongSWAN versions, including Moon which was
running StrongSWAN 5.6.1. No problem.

Then I upgraded Moon to StrongSWAN 5.6.3 and Moon cannot authenticate
anymore to Sun. Sun complains about a MAC mismatch :

    Jul 13 20:26:15 webfront-2 strongswan[1363]: 01[CFG] selected peer
    config 'net-net'
    Jul 13 20:26:15 webfront-2 strongswan[1363]: 01[IKE] tried 12 shared
    keys for '1.2.3.4' - 'netnetYomama', but MAC mismatched
    Jul 13 20:26:15 webfront-2 strongswan[1363]: 01[IKE] peer supports
    MOBIKE
    Jul 13 20:26:15 webfront-2 strongswan[1363]: 01[ENC] generating
    IKE_AUTH response 1 [ N(AUTH_FAILED) ]

Neither secrets nor config have changed on both peers, and are both
readable and listed, but the newly upgraded Moon cannot authenticate
properly and gets rejected.

Any idea?

    Thank you!

        Hoggins!
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