Before applying the fix provided in this article, refer to:
This article was written using the following software for testing:
Google Chrome prompts for authentication credentials while the address bar in the browser displays the virtual URL used for authentication.
When the name of your ProxySG appliance must be within your Trusted Sites due to your network deployment structure, the default option for User Authentication in the Trusted Sites Security Settings is set to "Automatic logon only in Intranet zone", which excludes sites located in the Trusted Sites. Thus, the browser prompts for credentials.
Change the User Authentication mode in the Trusted Sites Security settings.