sys_tun_open: failed to configure tunnel (mode 1): Operation not permitted

Hi

I am using ubuntu 14.04 LTS and try to create tunnel not working. The same config working find in ubutu12.04. Please help.

ssh xxx -w1:1 -oTunnel=Ethernet

cat /etc/ssh/sshd_config
X11Forwarding yes
PermitTunnel yes
GatewayPorts yes
AllowTcpForwarding yes

cat /etc/sysctl.conf
net.ipv4.ip_forward=1

debug1: Requesting tun unit 1 in mode 1
debug1: sys_tun_open: failed to configure tunnel (mode 1): Operation not permitted
Tunnel device open failed.
Could not request tunnel forwarding.
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting <email address hidden>
debug1: Entering interactive session.