How to Fix Mendeley 500 Internal Server Error

Resolve synchronization and connection issues swiftly with these proven technical steps.

Mendeley 500 Error Troubleshooting Setup

Understanding the 500 Error

A 500 Internal Server Error is a generic HTTP status code indicating that something has gone wrong on the server's end. In the context of Mendeley, this typically occurs during synchronization, when attempting to log in, or when using the web importer.

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Important Data Notice

A 500 error is purely a communication failure. Your library data, PDFs, and annotations are securely stored and will not be lost. Avoid making mass changes to your local library while troubleshooting.

Troubleshooting Workflow

Follow these sequential steps to isolate and resolve the connection failure.

Troubleshooting Flowchart
1

Verify Server Status

Before altering local settings, ensure Mendeley's servers are operational.

  • Visit the official Mendeley Status page.
  • Check Mendeley Support on Twitter/X for real-time announcements.
2

Clear Application Cache

A corrupted local cache can prevent successful API calls to the server.

# Windows Location

%LOCALAPPDATA%\Mendeley Ltd\Mendeley Desktop\

# macOS Location

~/Library/Application Support/Mendeley Desktop/
3

Reinstall Citation Plugin

If the error occurs specifically in Word or LibreOffice, uninstalling and reinstalling the plugin often resolves stale connection tokens.

Common Causes & Solutions

Error Context Likely Cause Primary Solution
During Desktop Sync Server Overload / Timeout Wait 15-30 minutes and retry. Check status page.
Web Importer Usage Stale Browser Cookies Clear browser cache and cookies for mendeley.com.
Word Plugin Insertion Outdated Plugin Version Update Mendeley Desktop and reinstall Word plugin.

Frequently Asked Questions

Will a 500 error delete my citations? expand_more
No, a 500 error is a communication issue. Your data is safely stored in the cloud and locally. Once resolved, synchronization will resume normally.
How long do Mendeley server outages typically last? expand_more
Most temporary 500 errors are resolved within a few minutes to a few hours. Check the official Mendeley status page for real-time updates.