Activating System Admin

Running FreePBX 13.0.192.8 on CentOS 6. Installed System Admin 13.0.74.3. When I go to activation and click activate a long time passes (1-2 minutes) and it goes right back to the activation page. Any tips or suggestions?

I have tested multiple pings to ensure DNS is resolving correctly. I have updated all modules to the most current stable version to make sure no known conflicts would occur.

Thanks in advance.