What happens when the central policy file is not longer accessible?
When you are using a central policy file, the ProxySG will check for updates every interval of time you have defined (or every 24 hours by default). If the file or the host machine hosting the file is not accessible, the ProxySG will continue to use the latest version of the central policy file it has downloaded. The same happens if the ProxySG reboots and the central policy file is not accessible, the proxy will continue to use the latest version it had downloaded.
Please refer to the following articles for more information