This article covers a scenario when your client net portal keeps showing loading data with a circle in the middle of the page , example:
Email Security.cloud
The main cause of the issue it's either the browser's cache or a proxy Inspection.
In order to resolve the loading of data in the clientnet portal you would need to:
1 - Clear the browser's cache and cookies
2 - Ensure that you are not using a proxy during the access. You can either bypass it or disable it.