CloudLinux manager reports: Unable to detect edition from jwt token

Issue

• СloudLinux Manager reports the following errors:

  Server unavailable
  
  There is a problem getting statistics for the dashboard from online databases.
  Please try again later.
  
  The received data is wrong. Contact support for resolution.
  Traceback (most recent call last):
  [...]
  CLEditionDetectionError(f'Unable to detect edition from jwt token: {CLN_JWT_TOKEN_PATH}. 
  'clcommon.lib.cledition.CLEditionDetectionError: 
  Unable to detect edition from jwt token: /etc/sysconfig/rhn/jwt.token. 
  Please, make sure it is not broken, error: Signature has expired

• A button to upgrade to CloudLinux PRO is shown in spite that CloudLinux PRO license installed

• An attempt to re-register the server fails:

  # /usr/sbin/rhnreg_ks --activationkey=***** --force
  An error has occurred:
  Error communicating with server. The message was:
  Unable to connect to the host and port specified

Environment

• CloudLinux OS Legacy
• CloudLinux OS Shared PRO
• cPanel

Solution

Ensure that the xmlrpc.cln.cloudlinux.com accessible and can be reached over 443/tcp.

Cause

Network issue between the CloudLinux server and the CLN licensing host.

Useful links

My systems are not checking in. What does that mean?