NAT3 means you have a strict blocking on the network particularly due to firewall or security policies on the router. Here's a few things you can try to get it to NAT2:

1. Enable UPnP on your router
2. Open up (or do port forwarding) the following ports for TCP and UDP in your router:

a) 80
b) 443
c) 465
d) 983
e) 3478-3480
f) 3658
g) 5223
h) 6000-7000
i) 9293
j) 10070-10080

This post has been edited by geekster129: Mar 1 2016, 10:20 AM