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Troubleshooting 0-Byte File Downloads in File Manager

28 threads Sep 16, 2025 Plugin → File manager

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Encountering a situation where files downloaded through the File Manager plugin are 0 bytes in size can be frustrating and halt your workflow. This guide will explain the common causes of this issue and provide steps to resolve it.

Why Do 0-Byte Downloads Happen?

Based on community reports and support interactions, the primary cause of 0-byte file downloads is a conflict between the plugin's operations and specific security configurations on your web server. Many hosting providers disable certain PHP functions for security reasons. If a plugin requires one of these disabled functions to package and deliver files for download, the process can fail, resulting in an empty (0-byte) file.

How to Fix 0-Byte File Downloads

1. Update the Plugin Immediately

This should always be your first step. Older versions of software can contain bugs or vulnerabilities that have since been patched. The File Manager team has explicitly advised users to update immediately to address security concerns that could manifest as failed operations. Ensure you are running the latest version of the plugin.

2. Check Your Server's PHP Configuration

The most likely culprit is a server setting that restricts key PHP functions. Users have reported that their servers block functions like exec, shell_exec, popen, and proc_open, which are sometimes used for compressing files into downloadable ZIP archives.

  • Contact Your Hosting Provider: Reach out to your host's support team and inquire if any critical PHP functions required for file compression and delivery are disabled. They can often provide a list or enable them if necessary.
  • Review Security Plugins: If you use a security plugin or firewall, check its settings to ensure it is not blocking the plugin's legitimate activities.

3. Verify File Permissions

While less common for this specific symptom, incorrect file permissions can prevent a plugin from reading a file, potentially causing a failed download. Ensure the files you are trying to download have appropriate read permissions for the web server user.

When to Seek Further Help

If you have confirmed your plugin is updated and your hosting provider assures you that no necessary functions are disabled, the issue may be more complex. In such cases, you may need to seek more specific troubleshooting. Due to WordPress.org forum guidelines, support for complex server-level issues or the Pro version is often directed to the plugin's dedicated support channel.

By following these steps, you can systematically diagnose and resolve the problem of downloading 0-byte files, restoring full functionality to your File Manager.

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