This issue popped up after upgrading FirePOWER Management Center (FMC) from version 6.0.x to 6.1.x and re-hosting Sensors from one manager to the other. As you upgrade Sensors to 6.1.x do not forget to match ASA code for FirePOWER devices based on the compatibility matrix. Components: Firepower Management Center: 6.0.1.2 …