“Server is busy” message is shown when trying to activate a license. “Error code 11” (license has been activated” is shown when you give it another try, however the license is never activated successfully in the Crystal.
The Crystal cannot connect to license server. Below are the possible reasons:
1. You didn't use LAN 1 port as WAN interface.
2. You didn't set up correct Primary DNS.
3. The network environment blocked license server or port 443.
Offline Activation: How to do the Offline Activation in Crystal?
Offline Transfer: How to do the Offline Transfer in Crystal
If this issue still persist, please send a mail to firstname.lastname@example.org or raise a ticket on our Zendesk.