AH00288: scoreboard is full, not at MaxRequestWorkers

Symptoms

When using the worker MPM, your sites may be slow or Apache may be unresponsive. An error similar to the following can be found in the Apache error log:

CONFIG_TEXT: [Wed Jul 10 13:34:17.264474 2024] [mpm_worker:error] [pid 1257:tid 22497688029312] AH00288: scoreboard is full, not at MaxRequestWorkers

Cause

The issue occurs when the worker child processes have reached the MaxConnectionsPerChild limit. It commonly occurs when a script doesn't close its connection once it finishes. The script causing the issue needs to be corrected; however, the MaxConnectionsPerChild limit can be increased as a temporary workaround.

Resolution

1. Log in to WHM as root
2. Navigate to Home / Service Configuration / Apache Configuration / Global Configuration
3. Scroll down to Max Connections Per Child
4. Select the Max Connections Per Child textbox
5. Enter the desired value
6. Click the Save button at the bottom of the page
7. Review the configuration
8. Click the Rebuild Configuration and Restart Apache button