Requirements
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Ensure the appropriate network ports are not blocked to allow inter-server communication. See Open ports in the Administration guide for details.
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FortiNAC Manager is registered and installed with the appropriate licenses. Refer to the Deployment Guide for details.
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FortiNAC Manager has the appropriate Endpoint License entitlements.
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(FortiNAC versions 9.4.3 and greater): Key files containing certificates are installed in the Manager(s) and all the FortiNAC servers to be managed. License keys with certificates were introduced on January 1st 2020. Appliances registered after January 1st should have certificates. To confirm, login to the UI of each appliance and review the System Summary Dashboard widget (Certificates = Yes). For additional details on certificates see KB article 192245.