Loopback Policy Processing Debug Series – Replace Mode | CB5 Blog 2010-02-10 10:20:50 • by admin Other Site Links loopback Now all three post's by Rich Crandall showing in great detail the modes of Group Policy Loopback. Loopback Policy Processing Debug Series — Normal Mode Loopback Policy Processing Debug Series — Merge Mode Loopback Policy Processing Debug Series — Replace Mode View on GitHub