Connect it through GE0/0 (assuming it is vE1K or vE2K) as 'ip dhcp client' is on by default. vEdge will acquire the new IP and control will be established. Typically, this is how customers stage it while configuring the device.
vpn 0 interface ge0/0 ip dhcp-client <<<<< nat ! tunnel-interface encapsulation ipsec no allow-service bgp