From a newsgroup post: "If you have installed AD using Dcprom , the dcpromo create the .(root) zone and when you need to use the forwords option as Microsoft recommendation for Internet names resolution you will always get the 4004 & 4015 errors in your log. To solve this problem and stop these events do the following:
1. Create a .(root) zone file
2. Right click the .(root) name and select Properties
3. Change the zone into a primary zone instead of the integrated AD zone type
4. Delete the .(root) zone