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(S)FTP Unable to Open Errors

Problem

The following error appears when you click Test Connection at Configuration () > System Settings > Database Backups:

(S)FTP: Unable to open for writing

Cause

This error indicates that WHMCS cannot open a test file in the PHP system directory (the sys_temp_dir PHP setting) via the PHP fopen function.

Solution

Verify that the following statements are true for the PHP environment where you have WHMCS installed:

  • The php.ini file includes a valid sys_temp_dir value.
  • The PHP system temporary directory has writeable permissions.
  • The fopen function is not disabled in the PHP configuration.
troubleshooting troubleshooting-article database-backups

Last modified: 2025 August 15