Hello Adnan,

By default, the Update Controller automatically detects proxy settings.  These would be the same proxy settings that is set in Internet Explorer.  For authentication, the current user's credentials are used.  If the proxy server settings are different or alternate user credentials are necessary, your application would need expose to the user a means to set these values, then use the values to set the proxy configuration properties on the update controller.  In AppLife Update, these settings are exposed in the tools..options..publishing dialog.

Hello Reiner,

You try to check for updates and catch exceptions, looking for the proxy authentication exception.  If you are using the async methods, then inspect the event arg (e) Error property in the method completed event handler.

You can, in the event of a proxy authentication exception, prompt the user for proxy logon credentials, apply the values to the Proxy properties of the update controller, and then try again.