From your post I've got you do can access your horizon from the inside of your network.
Are you able to access it from the gateway inside the network? Can you ping the gateway from the current horizon's ip?
If so you should configure routing on your gateway.
From your post I've got you do can access your horizon from the inside of your network.
Are you able to access it from the gateway inside the network? Can you ping the gateway from the current horizon's ip?
If so you should configure routing on your gateway.