I'm working on an app that changes network settings (ip, subnet mask, gateway, and proxy). It changes all these settings in the registry, but they don't seem to take effect. That is, even though the registry settings have changed, the computer continues to use the original network settings. Going into the IP Properties for the Local Area Connection still shows the old IP. Am I missing some way to change these settings or is there some additional step to get the new settings to set?

It sounds like these values are read by processes that only do that reading when they 1st start, and they have started before your app runs.

Look for some way to trigger the processes to reread the registry settings, or look for a way to stop and restart the processes.

I figured it out. Originally I was changing the tcp/ip settings for the registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\'service name'\Parameters\Tcpip.

What I was missing was that I also needed to change the tcp/ip settings for the registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Tcpip\Parameters\Interfaces\'service name'.

Thanks for your help though... :)