Unable to Ping/RDP to Windows Server 2003 R2 SP2 after running the DCPromo By gunnalagJanuary 11, 2014August 12, 2014Active Directory, Server Cause: This happens since DCPromo on Windows Server 2003 R2 SP2 enables FireWall on the system. You can notice this observing a Security/lock icon on your network interface connection. Fix: You need disable the Firewall on the DC. < p>