The “An unexpected error occurred” messages you’re seeing when scrolling through All Data Sources aren’t permanent failures, they happen when Tableau Cloud is trying to check the status of each data source in real time. Each red badge means a single connection check took longer than expected. Once those checks complete, the data sources appear normally. So now, when Tableau Cloud loads the Data Sources page, it tries to access your Tableau Server for each of the "Tableau Server" connection types and fails.'