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Since this monday after upgrade to latest on-premises data gateway version, we get refresh failures on some reports with the following error message:
"Unable to connect to the data source undefined."
Those reports were not modified and were working fine before gateway update.
The issue can only be reproduced in a report mixing (ex: with a merge) data from both on-premises source and sharepoint online file.
Reports sourcing both these data without any merge run fine.
We cleared credentials, checked all connections were categorized as "Organizational" as advised on similar error message in other threads, but with no success.
Refresh is successful via Personal data gateway and when downgrading to previous gateway version, I don't get a successful refresh.
I tried to apply the fix referenced on Power BI support page for some TLS/SSL issue but with no success, and this mention has disappeared from the portal since a few minutes: https://docs.microsoft.com/en-us/azure/security/fundamentals/tls-certificate-changes
Best Regards,
Rémy
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