cant get Net3 Concert to see my Response MK2 2 port gateway

I have a new Response Mk2 two-port Gateway, I have it configured with an IP address that is in line with my other ETC items. I went into NET3 Concert to configure the network to see the Gateway, I added the gateway Icon to the network map configured the 2 port gateway with the IP address, subnet, and Gateway IP address.  I cant get the network map to show that the Response MK2 2 port gateway is connected to my network. Any help would be great. thanks