From the article:
“I'm seeing lots of cases were a Direct Access proof of concept has been set up and it works really well for a while with both Windows 8 and Windows 7 (Server 2012 for the DA server - don't waste your time with 2008 R2).
The problem is that all of a sudden the Windows 7 test clients stop working. I do it all the time in my lab as well, mostly because i only need it to work for a while so i forget an important step for ongoing Win7 connections. Its really frustrating when you come back to a lab that is saved and its broken, especially when you are trying to show someone how awesome Direct Access is…”
The problem is most likely due to CRL checking.
Check out the details in the blog post at:
DEBRA LITTLEJOHN SHINDER
MVP (Enterprise Security)