Accessing the ezpublish legacy stack directly the DebugByIP Setting not working anymore. In 2012.06 (4.7) the setting is working correctly.
The mistake is comming to the code with introduction ipv6 support.

example:

1. site.ini
   [DebugSettings]
   DebugOutput=enabled
   DebugByIP=enabled
   DebugIPList[]
   DebugIPList[]=192.168.2.171
   DebugIPList[]=192.168.2.0/26

=> if clientIP is 192.168.2.171 or 192.168.2.33 the debug output should be available
=> if clientIP ist 192.168.2.99 the debug output should be hidden
but the debug output is shown!!!!!