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Activation failed – common scenarios

If the activation of ESET Internet Security is not successful, the most common scenarios are:

License key is already in use.

You have entered an invalid license key.

Information in the activation form is missing or invalid.

Communication with the activation server failed.

No connection or disabled connection to ESET activation servers.

Verify that you entered the proper license key and your internet connection is active. Try to activate ESET Internet Security again. If you use an ESET HOME account for activation, see the ESET HOME License Management - Online Help.


If you receive a specific error (for example, Suspended license or Overused license), follow the instructions in License status.

If you still cannot activate ESET Internet Security, the ESET Activation Troubleshooter walks you through common questions, errors and problems about activation and licensing (available in English and several other languages).