if you haven't heard, deploying MS15-009 breaks Anyconnect clients
MS15-009 - Secure Channel cumulative update changes TLS protocol renegotiation and fallback behavior 
link here
https://supportforums.cisco.com/discussion/12423591/latest-microsoft-feb-2015-patch-breaks-anyconnect-smc
we've tested AnyConnect version 3.1.05170  and 3.1.06079 which do not appear to be affected
there is a workaround by running vpnui.exe  in compatibility mode. 
			
			
			
				Well, I hope it doesn't also break the way Windows negotiates wireless connections with its native client.