That's probably even worse... Can we prevent non-friendly units from passing through unless authorised?  

Indeed, that strategy sounds like a solid basis. A few additions: I normally delete some women to make siege, and heros dont take up population space. I'd advise you against that in a normal mainland teamgame, as traders are too slow and defensive structures too weak, so even 3-4 cavalry can take out basically all trade.

The destruction damage will help with this, since your own units inside the walls will die from the destroyed wall.

You mean ms-2 , right? (sorry pedantic physicist here)    Also Iberian walls a bit broken; they let enemy army inside then the gate closes and traps a huge enemy army inside. The enemy then captures your CC. 

Some ISP choose to block certain sites by default as a part of their firewall. You can try to turn off firewall or children protection in the router settings. If it still doesn't work you can contact them to whitelist sites for you.  My ISP decided to partially ban Reddit and completely banned 4chan and many adult sites, despite the fact that all of these are allowed in my country.    Going back to the topic, Leopard's Mainland Twilight is the most recommended map for TGs.  You may want to try: Coastal Ranges, Continent, Hyrcanian Shores, Kerala. All of these are good for multiplayers games. 

Yeah, what the hecken is going on here? Frontier fiber internet (my wifi) blocks it, but T-Mobile 4G does not. 

Ok the next release of the community mod is near. I have heard a lot of player concerns and with this release we can try out some changes to see if they improve the situation. Walls may be placed over trees, causing the tree's destruction once complete. Additionally walls give to the garrisoned troops a range bonus in addition to the existing vision range bonus. When destroying walls, they will do damage in a 10 meter wide box (length the same as the wall). Destroyed walls would create a cascade of rubble that would be dangerous to attacking and defending troops. Players have been complaining a lot about hero baiting, so I have some ideas implemented to fix that. Hero acceleration is greatly reduced down to 5 m/s^2. To compensate for being very easy to shoot, they gain an additional 1000 hp. Since the Han have been lacking, I made some changes to the ministers to make them more interesting for dynamic gameplay. In p1, they gain 5 hack damage for each unit they kill. in p2, they gain 10 m/s movement speed. in p3, their last modification is that they trade the sword for a club and do 50 crush damage. This last part is a bit of a stretch historically but I think it will make for an excellent contribution to the way the Han play.   Let me know your feedback, and lets get ready to play!