I have a feeling this error is more to do with the connection to the server hosting the data versus the Tableau Server itself. But that might be completely wrong!
With that being said, my advice here is to create a ticket with Tableau Support as they are going to be in a much better position to help you after taking a look at logfiles.
However, I would be interested to know what the source of the data is you're connecting to in this report and how that connection is defined in terms of credentials etc.
Thanks for the quick reply!
Just some info, the source data would be from a data cube (Microsoft Services Analysis). When I connect to the data source itself from Tableau Desktop, it does not have a password at all but just the URL (without https). However, to connect to the data source, I need to be connected to my company's VPN. The Tableau Server has been installed in another machine (virtual machine I think?).
I am not a tech guy or engineer so I do not know the specifics of what he did when he installed Tableau Server. Weird thing was that it was working fine for a few days until last Friday when I suddenly received that error.
It sounds like a problem with the connection between the Tableau server and
the server hosting the cube. Like that connection can no longer be made or
the authentication is no longer working. I stand by my previous advice to
contact Tableau Support!
Yeap, just did. Thanks for your advice!
I used the Tableau app on the iPad and there was not problem loading my dashboards. Weird that it doesn't work on desktop computers but it works on the app...