Windows Update using proxy

Internet connection by proxy – update problems

Some programs could have problems in making their updates if you are behind a proxy. In general, this kind of problems can be found on programs that don’t allow you to select the type of Internet Connection, programs such as Windows Update or Microsoft Security Esssentials

For programs like Microsoft Security Essentials to update properly it is necessary to:

– have access on ports and domains used for updates (server configuration)

– have cache disabled for those domains (server configuration)

– have the operating system configured to use proxy for HTTP and HTTPS connections (user configuration)

Proxycfg is a Windows XP utility that allows you to configure WinHTTP. You can specify proxy settings using proxycfg for all programs that uses internet connection through HTTP or HTTPS protocol

If you have properly configured your proxy in Internet Explorer, then you can import the settings into WinHTTP by following this steps:  

1. Go to Start

2. Click on Run

3. In the new opened window write: proxycfg-u

4. Click OK

If you have not configured your proxy in Internet Explorer, then you can configure WinHTTP by following this steps:

1. Go to Start

2. Click on Run

3. In the new opened window write: proxycfg -d -p PROXYNAME “<local>”

4. Click OK

Now try to do an update using Windows Update or Microsoft Security Esssentials, upgrade should be completed successfully if the proxy server allows access to those specific websites