'Removes a firewall policy from server\'s IP
:param server_id: Id of the server
:rtype: ``str``
:param ip_id: ID of the IP address
:rtype: ``str``
:return: ``Node`` instance
:rtype: ``Node``'

def ex_remove_server_firewall_policy(self, server_id, ip_id):

    response = self.connection.request(action=('/servers/%s/ips/%s/firewall_policy' % (server_id, ip_id)), method='DELETE')
    return self._to_node(response.object)
