Recently Microsoft announced the availability of the DirectAccess Connectivity Assistant (DCA) v2.0. DCA v2.0 is required to be installed on Windows 7 DirectAccess clients when they are connecting to a DirectAccess Server running Windows Server 2012. It is important to note that DCA v2.0 is not required (and should not be installed) on Windows 8 DirectAccess clients. In addition, DCA v2.0 should not be installed on Windows 7 DirectAccess clients when they are connecting to a Windows Server 2008 R2/Forefront UAG 2010 DirectAccess server. For Windows 7 DirectAccess clients accessing corporate network resources over Windows Server 2008 R2/Forefront UAG 2010, install DCA v1.5. DCA v1.5 can be found on the Forefront UAG server at C:\Program Files\Microsoft Forefront Unified Access Gateway\common\bin\da\dca.
The DCA provides DirectAccess users with connectivity status information, detailed diagnostics and troubleshooting, and is required to support One-Time Password (OTP) authentication. You can download DCA v2.0 here.