I have two separate Windows machines and servers on one are working fine while servers on the other are not able to join.
Server #1 (not working)
Binding to a secondary IP with Multihome setting (I have two IPs on this box, secondary is DDoS protected so I am using that, datacenter says it's not their configuration either)
![Image](http://i.imgur.com/N3wBUrM.png)
Server #2 (working)
Binding to primary IP with Multihome setting
![Image](http://i.imgur.com/bDiKn2G.png)
It's the weirdest thing. I have made sure the redistributables and DirectX have been installed on both to no avail.