Resolved! ASA 5512X licensing
In the Guide of ASA 9.6 http://www.cisco.com/c/en/us/td/docs/security/asa/asa96/configuration/general/asa-96-general-config/ha-failover.html#ID-2107-00000379 It is mentioned concerning the Failover license: Failover units do not require the same l...