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Why do I get a cPanel / WHM Invalid License File Error Message ?

There are occassions when you log into Web Host Manager and are presented with an Invalid License File error. This causes WHM and CPanel to stop working.

This can be caused by a number of things, including ...

  • invalid hostname resolution
  • incorrect system date/time
  • IP address binding issues
  • local firewall rules
Of course, the first and most obvious thing to check is if the cPanel license is actually valid. This is easily done with the cPanel license validator.

If that checks out OK, then you should follow the Cpanel Forum Thread on Expired Licences

In our experience it is usually caused by either changes to your hostname/ip setup, or a mistake in your firewall rules.

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