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How to Fix Fabric Dataflow Gen2 Lakehouse Publishing Errors
Question details
The user is experiencing publishing failures when attempting to publish data to an existing Lakehouse using Microsoft Fabric Dataflow Gen2.
- Product
- Microsoft Fabric Dataflow Gen2
- Device & OS
- not provided
- Scenario
- Publishing transformed data from Dataflow Gen2 to an existing Lakehouse destination.
- Observed behavior
- Data previews and displays correctly within the dataflow, but the publishing process fails, throwing an ActionUserFailure message and SQL gateway proxy connectivity errors.
Before seeking assistance, ensure you have documented the complete ActionUserFailure error log, your gateway proxy configuration, and the exact Lakehouse destination settings.
Report and Investigate in the Microsoft Fabric Community
Because ActionUserFailure and SQL gateway proxy connectivity errors involve complex backend network and identity configurations, the most effective solution is to escalate the issue to Microsoft Fabric specialists.
Dataflow Gen2 relies heavily on proper gateway configurations when bridging cloud and on-premises environments. Proxy misconfigurations or restrictive network policies often cause connectivity drops during the publishing phase, even if data previews perfectly.
Collect all relevant information, including the full ActionUserFailure error trace, your current gateway version, destination configuration details, and your SQL endpoint connectivity setup.
Open your web browser and visit the official Microsoft Fabric Community website.
Create a new topic in the Dataflow specific section. Clearly describe that your Dataflow Gen2 fails on publish to an existing Lakehouse, and provide the logs you gathered so specialists can investigate the gateway proxy errors.
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Frequently Asked Questions
What does ActionUserFailure mean in Fabric Dataflow Gen2?
ActionUserFailure typically indicates that a data operation failed due to a user-level issue, such as insufficient permissions, expired credentials, or an incorrect configuration when the dataflow attempts to write data to the Lakehouse destination.
Why am I getting a SQL gateway proxy connectivity error when publishing?
This error usually occurs when the on-premises data gateway or virtual network (VNet) gateway cannot establish a stable connection with your Lakehouse SQL endpoint. It is frequently caused by restrictive network firewalls, proxy misconfigurations, or transient network timeouts.
Can I bypass the gateway if my data source and Lakehouse are both in the cloud?
Yes. If both your source data and your Lakehouse destination are cloud-native and reside in supported regions, you generally do not need an on-premises data gateway. You should verify your connection settings to ensure the dataflow isn't unnecessarily attempting to route traffic through a local gateway.
