Setting Proxy Settings via Registry -> Defaultconnectionsettings not updated

Hi, 

im facing the following issue since IE10.

IE10 is installed on a Remotedesktop Session Host. I control the student's internet access by setting a proxy setting in their registry hive.

Internet ON: via script i add ProxyEnable:1 / ProxyServer: proxyserver:8080

Internet OFF: via script i add ProxyEnable:1 / ProxyServer: noproxy:1234

This method worked perfect with IE9. After the update to IE10 i discovered that IE would not update the values in Defaultconnectionsettings at all time. For example, Intenet is off, and i turn it on. The script sets the 2 reg entires (Proxyenable/ProxyServer) correctly. When the Students start IE, for some IE will overwirte the ProxyServer and ProxEnable with values which are still saved in defaultconnectionsettings. In many cases, that is still the noproxy:8080. 

It all works fine if when manually setting the proxy via the Internet control panel. Then defaultconnectionsettings is updated immediately.  

How can i automaticially update the defaultconnectionsettings, to the value in Proxyserver? 

Thanks!