Email notification is sent every day from KernelCare cron task: The IP 203.0.113.2 was already used for trialing

Plesk for Linux kb: technical ABT: Group B FR:PPM-1998

Applicable to:

The following email notification is sent every day to a Plesk administrator:

CONFIG_TEXT: Cron root@plesk /usr/bin/kcarectl --auto-update
The IP 203.0.113.2 was already used for trialing on 2018-01-01

CONFIG_TEXT: Cron root@plesk /usr/bin/kcarectl --auto-update
The IP 203.0.113.2 was already used for a trial license on 2018-01-01
The notification may be also sent even if the the KernelCare extension has been removed.
The following message is sent after installing the KernelCare extension:

CONFIG_TEXT: HTTP Error 403: Forbidden, Retrying in 3 seconds...
HTTP Error 403: Forbidden, Retrying in 6 seconds...
HTTP Error 403: Forbidden, Retrying in 12 seconds...
The IP 203.0.113.2 was already used for trialing on 2018-01-01

A trial license for the KernelCare extension has expired. When checking the KernelCare license, the following information is returned:

# /usr/bin/kcarectl --license-info

Your trial license for the IP 203.0.113.2 expired on 2017-11-02

To continue using the KernelCare extension

If there is a purchased license for KernelCare already, update it in Tools & Settings > License Management > click Retrieve Keys
If there is no purchased license, buy a KernelCare license in Plesk at Extensions > My Extensions > KernelCare > Buy.

If KernelCare is no longer required, remove the extension

via Plesk
1. Log in to Plesk.
2. Go to Extensions > My Extensions > KernelCare > click the button > Remove.
  
  Note: If email notifications keep coming after removing the extension, apply the command-line instructions.
via a command-line interface
1. Connect to the Plesk server via SSH.
2. Remove the KernelCare extension:
  
  # plesk bin extension -u kernelcare-plesk
3. Remove the kernelcare package:
  - on CentOS/RHEL-based distributions:
    
    # rpm -e kernelcare
  - on Debian/Ubuntu-based distributions:
    
    # apt purge kernelcare

If migration to a new server was recently performed and license cannot be Retrieved

Contact CloudLinux support to unassign the license from old server: https://www.cloudlinux.com/support