Libvirt's default Linux bridge imposes limitations with some Sophisticated network characteristics. Try making use of OVS to put into action libvirt networks as an alternative. Two much more settings that should not need to be modified (presented you might have not modified this file just before) are PubkeyAuthentication and ChallengeResponseAuthentication. https://zionjptwz.blogscribble.com/29939870/the-ultimate-guide-to-servicessh