Windows Server 2003 R2 SP2 with all public updates before it became EOL.
SQL 2005 SP4 on-box.
NS 6.0 SP3 R13
Console 6.5 + updates
Task Server 6.0 + updates
AD Connector 6.1 + update
The above is my base snapshot.
On top of the base snapshot, I initally installed CMS L1 successfully, and first ran into this issue when I went to install CMS L2.
I found https://www-secure.symantec.com/connect/articles/troubleshooting-altiris-manageability-toolkit-vpro-technology-part-5-real-time-console-infr which unfortuantely did not help.
I then reverted back to my bas snapshot and just tried instaling RTCI on its own, but it still failed.
I cam honestly say that this is the first time I have had problems installing RTCI 6.x throughout all the years of supporting this product.
It starts the install but then stops for an unknown reason and rolls back.