Configmgr : Kerberos Ticket Size can stop you from connecting to vPro Systems and using IDER/SoL.
vPro AMT can leverage Kerberos authentication to allow management from your management console to the AMT firmware. Depending on the management console of choice (e.g. SCCM, Altiris, SMS) you may be using Kerberos or digest authentication. If you are using a management console like SCCM that only uses Kerberos authentication, there are a few things you should be aware of in case you are having problems managing your vPro systems.
In AMT (version 2.x, 3.x, 4.x, and 5.x) there is a Kerberos ticket size limit that varies among versions of AMT (see graph 1 below on specifics for each firmware version). With respect to Kerberos authentication, AMT has different limits for HTTP connection and Serial-Over-LAN (SoL).
Read the complete post here : http://communities.intel.com/community/openportit/vproexpert/blog/2009/03/23/kerberos-ticket-size-can-stop-you-from-connecting-to-vpro-systems-and-using-idersol
Hope it Helps ,
Kenny Buntinx