EnableEDNSProbes Registry Key

This reg key is used to enable or disable EdnsO response to EdnsO requests containing OPT resource records. To configure a DNS server to respond to EDNS0 requests containing OPT resource records with EDNSo response containing OPT resource records, must set this registry key to 1(enable). This reg key is enabled by default in Windows Server 2003 and Windows Server 2008. To disable it, just set the reg key to 0.

The following shows the reg key info:
Key Name: EnableEDNSProbes
Type: reg_dword
Default: enabled
Location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\dns\parameters
Functionality: enables or disables EDNS Probes.