The error message "Curl error (27): Out of memory" indicates that the system ran out of memory while trying to execute a curl command. This can happen for various reasons, including large requests or resource-intensive operations.

Here are some steps you can take to address this issue on a DirectAdmin server:

1. Increase Memory Limit: If possible, consider increasing the memory limit on your server. This can be done by adding more physical RAM or by optimizing the server's memory usage.

2. Optimize Server Configuration: Review your server's configuration and make sure it is appropriately sized for the tasks it is performing. This may include adjusting Apache, PHP, and MySQL settings to use memory more efficiently.

3. Check Server Logs: Examine your server logs (e.g., var/log/messages, var/log/httpd/error_log, etc.) for any indications of memory-related issues or other errors that might be contributing to the problem.

4. Limit Concurrent Connections: If the curl command is part of a larger application, consider implementing measures to limit the number of concurrent connections to prevent overloading the server.

5. Use Compression: If you're downloading large files, consider using compression to reduce the amount of data transferred. This can help alleviate memory pressure.

6. Split Requests: If possible, consider breaking up large requests into smaller, more manageable chunks. This can help avoid memory issues.

7. Upgrade or Optimize the Application: If the curl the request is part of a larger application, consider optimizing the application's code to use resources more efficiently or upgrading to a newer version that may have improved memory management.

8. Consider Swap Space: If your server is running out of physical memory, consider setting up swap space. This allows the system to use a portion of the disk as virtual memory when physical RAM is exhausted.

9. Monitor Resource Usage: Use tools like top, htop, or a monitoring service to keep an eye on resource utilization. This can help identify any processes or services that are consuming excessive memory.

10. Contact Support: If you're using a specific application or service (e.g., DirectAdmin), consult their documentation or support resources for guidance on handling memory-related issues.

Keep in mind that these are general suggestions and may need to be adapted to your specific environment and requirements. If you're unsure about any of these steps, consider seeking assistance from a system administrator or consulting the support resources for your server or application.