If you plan to change network hardware or configuration, or reinstall your server, you *must* revoke the FOP2 license prior to that, with the command:

/usr/local/fop2/fop2_server --revoke

that action will free up your activation code to be used again after your changes/reinstallation.

If you cannot restore the original MAC address of the machine, you won't be able to run --revoke (as it only works on a valid licensed version, and yours is currently unlicensed due to the MAC change). In that case you must request a manual revokation via email.

Remember not to post your activation code in a public forum

Best regards,

During the first registration, must be NIC eth0 (I have NIC eth1 and NIC eth2, Elastix, FOP2 - 2.25.2)?

It does not matter what NIC interface you use. The simplest one is to use eth0, as it is the one fop2 will default to use. If you *need* to use a different one for whatever reason, then you must indicate the nic name using the -i command line parameter, like

/usr/local/fop2/fop2_server --register -i em1

Once you do that, *every* time you invoke FOP2, you will need to remember to pass the same command line option if youu want it to recognize the license. You will also need to edit /etc/sysconfig/fop2 and add the parameter to the OPTIONS string defined there, so the init script will use it when you start/stop/restart.

Best regards,