Disable SSDP Discovery in Windows Messenger (Windows 2000/XP)

Windows Messenger uses the Simple Service Discovery Protocol (SSDP) to attempt to locate upstream Internet gateways on UDP port 1900. This tweak allows you to disable Universal Plug and Play Network Address Translation discovery to reduce bandwidth and increase security.

1.Open your registry and find or create the key below.

2.Create a new DWORD value, or modify the existing value, called "UPnPMode" and set it according to the value data below.

Exit your registry; you may need to restart or log out of Windows for the change to take effect.

Registry Settings
System Key : [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft \DirectPlayNATHelp\DPNHUPnP]
Value Name : UPnPMode
Data Type : REG_DWORD (DWORD Value)
Value Data : (2 = disable UPnP broadcasts)

Disclaimer : Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.