802.1x and Aegis

Hi All,

I am in the process of piloting an 802.1x wired lan. I am having an issue
that some machines work fine and other do not. The certificate
infrastructure
and radius servers have been in place for a while and are fine. Tnhe only
difference I can find between the machines that work are different versions
of the aegis protocol in the network connection. Does anyone know where this
component emanates. Is it supplied by the hardware manufacturer or
Microsoft?
If so where does one go about getting newer versions?

Thanks in advance