possible to use scutil to change system HTTP proxy settings?

Not for me so far, but I'm hoping someone can educate me as to where I'm going wrong.

The first problem is just to determine what key is appropriate for changing the proxy settings. The "list" command shows all the current keys. On one of my test machines, there were four possibilities which looked promising:

Setup:/Network/Service/04B9DBFA-50A0-4362-8F62-BF60FA3352EA/Proxies

Setup:/Network/Service/DEA19F1D-239E-11D9-91E0-000A95A76AFC/Proxies

State:/Network/Global/Proxies

State:/Network/0/Proxies

Here are the settings for these keys on my machine (which includes some settings from my various experiments that I've done already):

show State:/Network/Global/Proxies

<dictionary{

ProxyAutoDiscoveryEnable : 0

FTPPassive : 1

ExcludeSimpleHostnames : 0

ProxyAutoConfigEnable : 0

AppleProxyConfigurationSelected : 2

}

There were similar settings for the other keys.

As an experiment, I changed the proxy settings from Safari preference page, establishing an HTTP proxy with a URL of /a/b/c. Then I returned to scutil to see what effect this had; the data associated w/ the keys Setup:/Network/Service/DEA19F1D-239E-11D9-91E0-000A95A76AFC/ and State:/Network/Global/Proxies reflected these changes.

Then from scutil, I changed these settings to be

HTTPProxy : http://nelsons-w2k3.na.plumtree.com

HTTPPort : 4444

for those two keys. I did this with the following commands:

open

lock

d.init

get

Setup:/Network/Service/04B9DBFA-50A0-4362-8F62-BF60FA3352EA/Proxies

d.add ProxyAutoConfigEnable 0

d.add HTTPProxy http://nelsons-w2k3.na.plumtree.com

d.add HTTPPort 4444

set

Setup:/Network/Service/04B9DBFA-50A0-4362-8F62-BF60FA3352EA/Proxies

unlock

(For brevity I am only showing the sequence for one of the keys.) I use scutil to show me the contents of these keys again, and it appears that my changes have been successful. But when I returned to the OS X GUI to see whether these changes have taken effect, it appears as if I have done nothing.

This makes me think that there is either some extra level of caching on the GUI side, or that I am somehow not using scutil correctly. If it is the latter case, then apparently I'm making changes which are then visible within scutil's world, but am missing some step which would propagate these changes out to the rest of the OS X world. I'll be curious to hear any insights you might have.

-Nelson