[strongSwan] Upgrade to 5.6.3 breaks Windows 10

Tobias Brunner tobias at strongswan.org
Thu May 31 11:44:03 CEST 2018

Hi Christian,

> *IKE authentication credentials are unacceptable. The error code
> returned on failure is 13801.*

If you send the same certificate then this is strange.  Did you try
going back to 5.6.2 to verify that it's actually caused by strongSwan?
Otherwise, I'd assume the reason is a Windows 10 update (or upgrade e.g.
to v1803, which apparently brought some updates to the IKEv2 client as
IKEv2 fragmentation is now supported).  In which case further analysis
is required.


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