aaronparker

OK, cool. Thanks for the update.

Thanks for the reply. What I was getting at is that Paint.NET works correctly with a proxy server manually specified and with proxy authentication enabled. However with the proxy autoconfiguration script, Paint.NET does not work. So in my situation, Paint.NET is working with proxy authentication with a proxy server manually specified, it's just not using the proxy auto-configuration script for whatever reason.

Try using software virtualisation with Altiris SVS (it comes in a free personal addition). http://juice.altiris.com/page/86/get-svs-here-now This will allow you to virtualise Paint.NET 3.0 and enable you to run both at the same time.

We use a proxy configuration script inside the network to download proxy server settings and configure the browser automatically: Tools / Internet Options / Connections / LAN Settings / 'Use automatic configuration script' If this is enabled and Internet Explorer is working correctly (i.e. web browsing access via the proxy server works), the Paint.NET 'Check for Updates' feature returns the following: There was an error checking for update. The server returned the following error code: HTTP 407 (ProxyAuthenticationRequired) No unauthenticated HTTP access is allowed outbound, so a proxy server setting is required, however, Paint.NET does work successfully if a manual proxy server is specified in Internet Options.