SharePoint Document Issues

Fix Connection Reset When Streaming Large CSV Files from SharePoint

Olivia Miller Oct 9, 2026 869 views

Question details

A Java application experiences SSL connection resets when streaming large CSV files from SharePoint using the Microsoft Graph API.

How to Fix Connection Reset When Streaming Large CSV Files from SharePoint

Product: SharePoint / Microsoft Graph API
Device & OS: not provided
Scenario: Streaming large CSV data sets through a Java application connected to SharePoint.
Observed behavior: Smaller files process normally, but extended processing of large files triggers an SSL connection reset and failure during the download stream.

Before you start

Verify your current Java version and ensure your network infrastructure does not have strict timeout policies that automatically sever long-running idle connections.

Solution 1Recommended

Escalate to the Microsoft Q&A Community

Because this involves complex Microsoft Graph API and Java interactions, escalating the issue to Microsoft engineers with proper diagnostic data is the most effective approach.

Network timeouts during large API streams are often related to server-side constraints, load balancer configurations, or specific Graph API limits that require specialized engineer review.

Access Microsoft Q&A

Navigate to the official Microsoft Q&A community platform using your developer account.

Create a detailed post

Draft a new question and apply the specific 'SharePoint' and 'Microsoft Graph API' tags to reach the correct engineers.

Include environment details

Provide your exact Java version, Graph API request headers, authentication method, and current HTTP client timeout settings.

Attach logs

Paste the complete exception trace, including the SSL connection reset error and any relevant network logs, to help engineers investigate the failure.

Tagging is crucial: Using the correct tags ensures your development issue is routed directly to engineers and experts with deep experience in SharePoint customization and Graph API limits.

Solution 2

Implement API File Chunking

Reduce the risk of SSL connection timeouts by downloading the large CSV file in smaller, manageable byte chunks.

Free Microsoft Office alternative

Manage and Analyze Large CSV Files Offline with WPS Office

While debugging your SharePoint API connections, you may need a reliable way to inspect and analyze large CSV files locally. WPS Office is a free, lightweight Microsoft Office alternative that opens massive datasets quickly and maintains full compatibility with Excel formats.

1. Download the software: Visit the official WPS Office website to download the free installer for your operating system.
2. Install WPS Office: Run the installation package and follow the quick on-screen prompts to set up the suite.
3. Open your CSV: Launch WPS Spreadsheet and drag-and-drop your large CSV file into the workspace to view it instantly.

Highly compatible with Microsoft Excel formats (.csv, .xlsx, .xls).Lightweight architecture handles large CSV datasets efficiently without crashing.Familiar user interface makes it easy to filter, sort, and analyze raw data.Completely free core features for seamless everyday office tasks.

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Frequently Asked Questions

Why does the Microsoft Graph API drop connections for large files?

Large files take longer to stream, which can trigger default idle timeouts on network load balancers, proxies, or the Java HTTP client itself, resulting in an SSL connection reset before the download finishes.

How can I prevent my Java HTTP client from timing out prematurely?

You can manually increase the read timeout and connection timeout settings in your Java HTTP client configuration (e.g., setting a 5-minute duration). However, if the reset is enforced by SharePoint's server-side limits, local adjustments will not prevent the drop.

Does downloading the CSV as a ZIP file help with API streaming issues?

Yes, if the source file is compressed before downloading, it significantly reduces the overall payload size and network transmission time, lowering the chances of hitting an SSL connection timeout.

Can I use SharePoint's native sync to bypass Graph API limits?

If API streaming continues to fail for extremely large datasets, an alternative is to use the OneDrive or SharePoint sync client to sync the directory locally. Your Java application can then read the CSV directly from the local file system without API constraints.

Document & File Issues