1. I disabled all port-forwaring, made sure NAT-filtering wasn't relaxed etc. and made sure all firewalls etc. also enabled.
2. Loaded SINS 1.1
3. Clicked "Host Setup"
4. Clicked "Run Hosting Test" (making sure use "Alloy" was checked)
4. After the test completed it showed "IP is not visible" in red next to "Hosting Capability"
5. Attempted to host a game anyway, and it worked!
What all of this means?
If you were having hosting problems before you certainly shouldn't be having them anymore...
Even with everything on my network set to "normal operation" (ie. no port-forwarding and everything secured) Alloy had no issues tunneling past/through it all to make the connection.
Well done SD/IC!
EDIT:
Having said this, should anyone have any hosting/connecting issues with this beta at all, please post to this thread and we will get the issues solved for you.