Forum Discussion
Dataflow gen2 with Virtual Machine Gateway refresh failed
Based on your description and the screenshot, it seems that your Dataflow Gen2 is failing on refresh despite the successful connection and preview. This can happen due to several reasons, especially when using a trial SKU or with specific configurations like a VNET Gateway. Here are some steps and considerations that might help resolve the issue:
1. Check Trial SKU Limitations
- Some features in Power BI are limited or have lower resource allocation with trial SKUs. Refresh operations, especially for dataflows that connect to external sources via VNET Gateways, may be impacted.
- If possible, try running the dataflow on a production SKU or Premium Per User (PPU) trial account to see if the issue persists.
2. Verify VNET Gateway Configuration for Dataflow Gen2
- Although the VNET Gateway works for semantic models, Dataflow Gen2 might have additional requirements.
- Make sure that the VNET Gateway has been explicitly configured to support Dataflow Gen2 connections. This may involve additional settings in your network configuration (e.g., firewall rules, whitelisting Power BI IP ranges) to allow dataflows to access the database.
3. Check Firewall and Network Settings
- Ensure that all necessary IP ranges used by Power BI’s Dataflow Gen2 service are allowed in your network firewall settings. Microsoft provides a list of IP addresses that Power BI uses, which may differ slightly for Dataflow Gen2.
- Additionally, make sure your SQL Server is configured to allow traffic from these IP ranges.
4. Inspect the Error in Power BI Service Logs
- Sometimes, a more detailed error message can be found in the Power BI Service logs.
- Go to Settings > Manage Gateways > VNET Gateway Logs and look for any errors or warnings related to the dataflow refresh. This might provide more specific information on what is causing the failure.
5. Adjust Dataflow Query Settings
- In Power Query for your dataflow, try to simplify the transformations temporarily and test a refresh. Some complex transformations may work in the Power Query editor but fail during refresh due to resource constraints or unsupported features in Dataflow Gen2.
6. Enable Enhanced Compute Engine (if applicable)
- If your dataflow operations involve large datasets or complex transformations, enabling the Enhanced Compute Engine may help improve performance and stability. This setting is available on some Premium SKUs and can sometimes alleviate issues with data transformations in Dataflow Gen2.
7. Check Microsoft Power BI Known Issues
- Power BI periodically has known issues with services like Dataflow Gen2, which Microsoft usually posts about on their Power BI Support page.
- If this is a new or emerging issue, it’s possible that a service-related bug is impacting the refresh, especially with trial SKUs.
8. Open a Support Ticket with Microsoft
- If none of the above solutions work, you may need to open a support ticket with Microsoft for deeper investigation. They may have access to internal logs and diagnostics that can provide insight into the refresh failure.
In summary, check for trial SKU limitations, verify VNET Gateway settings, check firewall/IP configurations, inspect service logs, and try simplifying transformations. If the issue persists, contacting Microsoft Support may be the best course of action. Let me know if you have questions about any of these steps!
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Kind Regards,
Poojara
Data Analyst | MSBI Developer | Power BI Consultant