Fail2ban is built into the PBX’s. If you had too many failed logins you can get blocked. You can clear them from the web back end (and white-list your IP) or you can reboot the PBX from the VPS control panel and that clears all the blocks.
Your probably being blocked by the Fail2ban firewall on the VPS.
To whitelist your IP address, click ADMIN -> SYSTEM ADMIN -> INTRUSION DETECTION and then add your external IP address of your Internet connection into the whitelist box and click SUBMIT QUERY.
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