| Error | Cause and fix |
|---|---|
| SSL “wrong version number” or “unexpected eof” | HTTPS is on but the port speaks plain HTTP (or the opposite). Use port 2087 with HTTPS for WHM and SonicPanel; 2199 (HTTP) or 2198 (HTTPS) for Centova Cast. |
| SSL certificate problem | The panel uses a self-signed certificate. Turn Verify SSL certificate off for that server. |
| Connection timed out / refused | A firewall blocks your website. Allow your website server's IP in CSF/Imunify on the panel server, and check the hostname. |
| Invalid API key / 401 | Copy the key again (no spaces). For SonicPanel the API username must be the one shown on the Billing & Automation page. |
| SonicPanel: IP blocked (HTTP 500) | 5 failed logins block your IP for 1 hour. Wait, or delete /usr/local/sonicpanel/blocked as root. |
| Package not found | The plan's package name must match the server exactly (case-sensitive). Edit the plan and pick it from the list. |
Every failed action is saved on the service as Last error and sent to your notifications, so you always see the real reason.
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