This article will provide information how to access the local GUI of a SiteManager from an HMI that might not allow for authorization prompts.
When accessing the SiteManager from the HMI you would need to use the following address in order to connect to the panel: https://admin:password@IPAddress
Admin = The username you use to access the SiteManager, this is always admin.
password = The local password for the SiteManager.
IPAddress = The IP address of the SiteManager.
In the example below you can see how one would do it using a Siemens Panel.