Forum Discussion
Notebook randomly failed with error SSL: UNEXPECTED_EOF_WHILE_READING
- 7 months ago
Hi KZ_DevOps ,
Transient errors are common in cloud platforms like Microsoft Fabric and may occur due to temporary backend or network conditions. These cannot be fully avoided from the client side, and there are no SSL or notebook configuration changes that will prevent them. The recommended approach is to implement retry logic with exponential backoff and monitor error frequency.
Microsoft documentation references:Fabric Notebooks troubleshooting guide - Microsoft Fabric | Microsoft Learn
Troubleshoot the Warehouse - Microsoft Fabric | Microsoft Learn
Troubleshoot connectors - Microsoft Fabric | Microsoft Learn
Hi KZ_DevOps ,
This issue is very likely due to temporary connectivity or service side disruptions within Microsoft Fabric / Kusto, rather than any defect in the notebook logic itself. The SSL: UNEXPECTED_EOF_WHILE_READING error generally occurs when the Fabric/Kusto service unexpectedly terminates a TLS connection, which can happen during short-lived backend events such as service restarts, capacity scaling, or internal network routing changes. A strong indication of this transient behavior is that the notebook typically completes successfully when retried. To address this, it is recommended to retain and slightly enhance the existing retry mechanism by applying exponential backoff with brief delays, ensure that each notebook execution establishes a fresh HTTP/TLS connection instead of reusing long lived sessions, and, where feasible, introduce a small random offset to the pipeline schedule to reduce the likelihood of recurring timing collisions. No adjustments to SSL settings, Python versions, or certificates are necessary, as this is a known and expected behavior for high frequency workloads interacting with Fabric services.
Hi KZ_DevOps ,
I hope the information provided above assists you in resolving the issue. If you have any additional questions or concerns, please do not hesitate to contact us. We are here to support you and will be happy to help with any further assistance you may need.
- KZ_DevOps7 months agoRegular Visitor
Thank you for your promt responce. But does it mean that such type of issues (Transient errors) are expected ? And technically we cannot do anything on our end to avoid such issues ?
- v-sshirivolu7 months agoCommunity Support
Hi KZ_DevOps ,
Transient errors are common in cloud platforms like Microsoft Fabric and may occur due to temporary backend or network conditions. These cannot be fully avoided from the client side, and there are no SSL or notebook configuration changes that will prevent them. The recommended approach is to implement retry logic with exponential backoff and monitor error frequency.
Microsoft documentation references:Fabric Notebooks troubleshooting guide - Microsoft Fabric | Microsoft Learn
Troubleshoot the Warehouse - Microsoft Fabric | Microsoft Learn
Troubleshoot connectors - Microsoft Fabric | Microsoft Learn