Technical Tip: Unable to select interface when configuring HA Reserved Management Interface

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Description	This article describes that the interface is not shown when configuring HA Reserved Management Interface.
Scope	FortiGate.
Solution	For the example below, it is impossible to select port3 under the ha-mgmt-interface.                                       Check that port3 has been assigned to the DHCP server, remove the port3 if it is assigned:                     Check if the static route has been configured, remove the port3, or assign the static route to the other interface:                                                                        Check if the port3 is assigned to address remove the address or assigned to a different interface:                                                                       Alternatively, a grep command can be used to check whether the port3 is in use and verify the related configuration to it: show | grep -f port3 More ideas about the usage of the grep command can be found in Technical Tip: The usage of 'grep' filter command on the FortiGate CLI. The port3 will be shown under the ha-mgmt-interface after removing from the DHCP server, static route, and the address: Alternatively, check if the interface is used as a reference via the CLI: diagnose sys cmdb refcnt show system.interface.name port3 Related article: Technical Tip: How to Check Referenced Objects