License is invalid for this server. How to count the number of existing users on the server?

Issue

One of the following errors occurs during Imunify360 registration or installation:

WARNING: License is invalid for current server

WARNING: License is invalid for this server
Registration was not successful. Exiting.

Imunify360 requires a different license type based on the number of users registered on the server.
How can I count how many users currently exist on the server?

Environment

• cPanel
• Imunify360
• Plesk
• DirectAdmin
• CyberPanel
• No hosting panel systems
• CLN

Resolution

Please, refer to What does "user" mean when buying a license? Types of licenses to get more information about users before counting them. 

• cPanel

  To count users, run the following command:

  # grep -Po '^(?<!#)\s*\w+\s*(?=:)' /etc/userplans | wc -l

  Also, it may be useful to list users. To do so, run the following command:

  # cut -d":" -f1 /etc/userplans | sort -n | uniq

• Plesk

  To count users, run the following command:

  # plesk db "SELECT COUNT(DISTINCT cl_id) FROM domains"

• DirectAdmin

  To count users, run the following command:

  # cut -d":" -f2 /etc/virtual/domainowners | sort -n | uniq | wc -l

  Also, it may be useful to list users. To do so, run the following command:

  # cut -d":" -f2 /etc/virtual/domainowners | sort -n | uniq

• No hosting panel systems

  To count users, run the following command:

  # cat /etc/passwd

  By default, Imunify360 will use Linux system users, limited by uid_min and uid_max from the /etc/login.defs.
  
  

• CyberPanel

  You can check the number of users using the method for servers without the control panel (check the above option). CyberPanel creates a new user for each "website", and doesn't create a user for additional "domain" inside "website".
  
  

• The number of users matches the license.
  
  If the number of users matches the license, but registration fails due to an error, it is necessary to run the command:

  # imunify360-agent update-license

  And then, register the server again.
  
  

Cause

The error message received during the license key registration means the number of users on the server exceeds the user limit provided for the Imunify360 subscription purchased. Also, this error may occur when activating the ImunifyAV license with Imunify360 installed.

Useful links

• What does "user" mean when buying a license? Types of licenses
• Imunify360 pricing
• Imunify360 licensing
• How to upgrade or downgrade the Imunify360 license?