pfSense

Yes, I can confirm this issue. Mobile Client ("Roadwarrior") IPSec access no longer works after upgrading to 2.4.3 (we're using IKEv1).

Apparently others are affected too: https://forum.pfsense.org/index.php?topic=145891.0

A quick fix for this would be very highly appreciated, because this is quite critical for us. Thanks a lot!

Seeing the same error ("The VPN Shared Secret is incorrect.") on iOS. Exact same config worked before the update to 2.4.3.

Well, ipsec.secrets is written out identically on both a working (2.4.2) and non-working (2.4.3, 2.4.4, 2.3.6) setup and the only difference I see is the strongSwan version. 5.6.0 is working, 5.6.2_1 is not.

strongSwan 5.6.2 release notes say "The lookup for PSK secrets for IKEv1 has been improved for certain scenarios.", which seems to be associated with https://wiki.strongswan.org/issues/2497 but apparently that has broken secrets that were working previously.

There is probably a way to reformat ipsec.secrets to work around it. Lots of info on that strongSwan ticket to sort through.

I tested the diff and can confirm it works again. Thank you so much for fixing this so quickly Jim!

Was able to confirm fix worked.