Hi @kjdevera ,
One potential cause of this issue is that the session state is not being managed properly. In order to prevent the old Windows Authentication pop-up from appearing after a time-out, you'll need to ensure that the session state is being managed properly and that the user's authentication status is being persisted across requests.
One possible solution is to implement a session state provider that can manage the authentication status of your users. This will allow you to track the authentication status of each user and prevent the old Windows Authentication pop-up from appearing after a time-out.
Another potential solution is to disable the Windows Authentication pop-up altogether by configuring your Power BI Report Server to use only your custom forms authentication. This can be done by modifying the authentication settings in the Power BI Report Server configuration manager.
It's also worth noting that the CustomSecuritySample you mentioned is only a sample implementation of custom forms authentication, and may not be suitable for all scenarios.
If the problem is still not resolved, please provide detailed error information and related operation screenshoots. Looking forward to your reply.
Best Regards,
Henry
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
