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There are only couple of releases where the PRF SHA2 works with 3rd party. Fix for CSCvb21927 has been implemented and then pulled back because it broke different functionality.
The current status of CSCvb21927 is that in order to have an ultimate fi...
It's a compatibility issue between ASA and 3rd party clients. It occurs when PRF SHA2 (SHA256 or SHA512) is being used along with certificate authentication.
As a workaround you should configure PRF SHA1 under IKEv2 policy on the ASA.
The bug CSCvb21...
