SharePoint Document Issues

How to Fix SharePoint and OneDrive Server Busy Upload Errors (Error 1033)

Maira Mehtab Sep 27, 2026 872 views

Question details

Users are encountering a 'server busy' error when attempting to save or upload files to SharePoint or OneDrive, typically indicated by a Throttle.htm page with error code 1033.

Product: SharePoint and OneDrive
Device & OS: not provided
Scenario: Saving or uploading single or batch files to SharePoint or OneDrive document libraries.
Observed behavior: The file upload fails, and the system displays a /_layouts/15/Throttle.htm#1033 URL, indicating that the server is actively throttling requests due to high activity or excessive load.

Before you start

Verify your network connection stability and check the Microsoft 365 Admin Center Service Health Dashboard to ensure there are no ongoing service outages affecting SharePoint Online.

Solution 1Recommended

Investigate and Reduce SharePoint Throttling Limits

Identify what is triggering the Error 1033 throttle limit and reduce the immediate server load to allow normal uploads to resume.

SharePoint Online uses throttling to maintain optimal performance and reliability across the tenant. When users or background processes execute too many concurrent operations, the server temporarily blocks requests, redirecting users to the Throttle.htm error page.

Check the Error URL

Inspect your browser's address bar. If the URL contains /_layouts/15/Throttle.htm#1033, your account or Microsoft 365 tenant is actively being throttled by the server.

Pause Heavy User Activity

Temporarily stop any bulk file uploads, massive data migrations, or intensive automated synchronization scripts that are currently running against your SharePoint or OneDrive accounts.

Review File Sizes and Quantities

Check if you are uploading extremely large files or syncing thousands of newly created files simultaneously. Break your uploads down into smaller, manageable batches.

Stagger Concurrent Operations

Space out your file transfers over a longer period. Wait at least 15 to 30 minutes for the server's throttle limit to reset before attempting to upload files again.

Temporary Restriction: Throttling is usually a temporary restriction. Reducing your request volume and waiting for a short period is often the fastest way to resolve the error.

Solution 2

Contact Your SharePoint Administrator

If throttling persists despite reducing your personal activity, the issue may stem from tenant-wide usage that requires administrative intervention.

Free Microsoft Office alternative

Try WPS Office for Seamless Document Management

While waiting for SharePoint and OneDrive server throttling issues to be resolved, you can rely on WPS Office for your daily document needs. It's a free, lightweight, and highly compatible Office suite that allows you to easily edit files and save them locally or to alternative cloud storage without interruption.

1. Download WPS Office: Visit the official WPS website to download and install the free WPS Office suite on your device.
2. Open Your Documents: Launch WPS Office and open your existing Word, Excel, or PowerPoint files with perfect formatting retention.
3. Save Without Interruption: Edit your documents and save them to your local drive or directly to WPS Cloud to bypass ongoing SharePoint upload errors.

Fully compatible with Microsoft Office file formats like DOCX, XLSX, and PPTX.Features built-in WPS Cloud storage, providing a reliable alternative when OneDrive is busy.Lightweight application that opens quickly and runs smoothly on PC, Mac, and mobile.Familiar user interface ensuring a zero-learning-curve transition from Microsoft Office.

Frequently Asked Questions

What does error code 1033 mean in SharePoint?

Error code 1033 typically appears at the end of a Throttle.htm URL. It indicates that Microsoft 365 is temporarily throttling your requests because the server is too busy, or your tenant has exceeded its allowed operations limit.

Will waiting resolve the OneDrive server busy error?

Yes. In most cases, Microsoft 365 throttling is temporary. Pausing your file uploads and waiting for a period (usually a few minutes to an hour) allows the server load to normalize, which often resolves the upload error.

Can syncing small files trigger SharePoint throttling?

Yes. Throttling is frequently triggered by the volume of concurrent operations rather than just the size of a single file. Syncing thousands of small, newly created files simultaneously can easily cause server busy errors.

How can I prevent server busy errors when migrating data to SharePoint?

To avoid triggering the throttle limit during data migration, use official Microsoft Migration tools, schedule heavy data transfers during off-peak hours (nights or weekends), and avoid running multiple background synchronization scripts concurrently.

Document & File Issues