Activesync 4.5 internet proxy parameters lost at each connexion

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Hello,
My proxy information is lost each time I plug my WM6 device !

WM6 + Activesync 4.5 set to "This Computer is connected to : internet"
AllowLSP = 0

- Internet Pass-Through doens't work.
- If I set the proxy settings on the device, it works.
- then I unplug & replug the device => proxy settings are lost on the
device. Internet pass-through doesn't work anymore !

The proxy setting I use on the device is an HTPP type, format
"myproxy.subdomain.domain:8080"

Can anyone tell me how to setup a persistant proxy setting or how to
configure the proxy information on the PC to pass it to the device
each time it is plugged ?

Of course, I allready tried all "This Computer is connected to"
settings

On my PC, the proxy settings is the following, under IE / Options /
Connexions / Network parameters :
- Auto detect connexion params = Not checked
- Use auto config script = Checked ; adress = http://proxy/proxy.pac
this script returns the name & port of the proxy (format
"myproxy.subdomain.domain:8080")

Thanks for your help.

.