On Tuesday, July 28, 2009, beginning at 5:00 PM, TSO will deprecate the CBC SSH ciphers on all managed CoC Mac, Linux, and Solaris systems in response to an OpenSSH vulnerability (see http://alert.is.gatech.edu/index/alert?id=205 for details). Established SSH sessions will not be terminated by this maintenance, so no users should be impacted. This maintenance should be concluded by 7:00 PM, July 28.