Windows XP Professional SP3 clients with Internet Explorer 8
Wireless lan controller cluster with redundant(2) webauthentication anchors (all AIR-CT5508-XXX-K9 sw rel 7.0.116)
"After installing MS12-006, you may experience authentication failure or loss of connectivity to some HTTPS servers. This issue occurs because this security update changes the way that records are sent to HTTPS servers. To address an information disclosure vulnerability, SChannel now implements certain ciphers used in SSL 3.0 and TLS 1.0 in a more secure fashion. The updated behaviour is fully compliant with the RFCs, but it is something that has generally not been used on the internet before
There are two fixes involved: the SChannel fix makes the new behaviour available, and a fix included in the December Cumulative Update makes Internet Explorer request that more secure option. The behaviour will change only if both are present"