How the AutoUpdate repository works
The AutoUpdate repository list (SITELIST.XML) specifies the configuration information necessary to perform an AutoUpdate task.
When an AutoUpdate task is performed, a connection is made to the first enabled repository (update site) in the repository list. If this repository is not available, the next repository is contacted, and so on until a connection is made, or until the end of the list is reached.
If your network uses a proxy server, you can specify which proxy settings to use, the address of the proxy server, and whether to use authentication. Proxy information is stored in the AutoUpdate repository list. The proxy settings you configure apply to all repositories in the repository list.