[solved] Is it possible to activate license without connecting to internet?

[Cloudsrest]

I have Bridged the NAS to the internet via PC !!! I didn't know about "bridge" before...Thanks Simon, you gave me this clue!
The instructions is below( in case anybody is like us "old machines, old fashion") :
->open network and sharing Center

->click Wireless network connection status
->click properties
->choose sharing, and click the internet connection sharing...."allow other network users to connect through this computer's internet connection"
->click OK

->check the lan connection, it should automatically get a IP 192.168.137.1, subnet mask 255.255.255.0

That's it. our NAS can connect to internet now.

But I can't activate the trial license. the notification is:
Licese server error 500: [b657e8c9] no value for last_ukey_bin