The 500 error is due to Sentora 1.0.3 not being fully compatible with PHP 7.4 (it relies on deprecated MySQL/PHP functions). Your sites work, but the panel breaks.
Fix options:
Fix options:
- Check Apache/PHP error logs for details.
- Downgrade PHP to 5.6–7.2 (works best with Sentora).
- Long term: consider migrating to an actively maintained panel (ISPConfig, Virtualmin, etc.).