My eth with right ip is eth2 , i've follow the doc and modify the the demon with this syntax

OPTIONS="-d -i eth2" (in /etc/sysconfig/fop2)

and execute this command to register the product:

/usr/local/fop2/fop2_server --register -i eth2

The problem is show here, after i put my license code received the error

License Activation

Enter your serial code: my-lic-code
Could not contact registration server, please try again later. at /tmp/par-root/cache-28c5fa7b6407f207f07d5aeb55e903d3eda38d5c/inc/lib/FOP2/License.pm line 504, <> line 1.

Could be my network problem? /(firewall block?)
The pbx is installed in a big IT agency with high level security rules, most probably the problem is mime.

I need to know the ports and the IP that the program use to perform the registration and i'll ask to network section to open them.

In last, the comunication between fop2 and your server must be ever available or only for registrarion?

Thanks in advance Davide