We've been having a great time playing Animal Crossing New Leaf and exploring all of the features and townsfolk it has to offer. We decided we would go ahead and take the plunge and see who else's town we could wander into and share the fun with -- you know, the more the merrier! Well, we were able to see a list of towns we could venture into, selected one, and patiently waited with Porter for the next train to arrive and take us to our exciting new destination. Imagine our utter disappointment when we received the 018-0512 error and were not able to travel! Well, thinking maybe it was something simple, I ensured all of our internet settings were correct on our 3DS systems, and even moved closer to our wireless access point -- still nothing. We tried a little later with a relative that had also downloaded a copy of the game and lives about an hour away from us, and we were able to gain access to their town -- the frolicking began! We even had another unexpected visitor show up and enter our town, which was cool, so we thought we were good to go. We tried again later on to access some other towns, and ended up with the dreaded 018-0512 error again -- UGHHH!!!!
When I searched on the internet, I found one thread on the Nintendo Support Forums where other unlucky New Leafers were marooned to their own towns, and experiencing the same fate as we were. Some of the people experiencing the error had physical game cartridges, but it seemed like the majority of people had downloaded versions, just like us. We tried various times throughout the day to connect to the other towns, but didn't have any luck. Well, I searched again on the internet and found that Nintendo had updated their Support page for the error code 018-0512 and included a possible fix for the error.
It appears that you have to assign a dedicated IP address for your 3DS, and then also open the DMZ settings on your router to allow for communication between your 3DS and other 3DS systems you want to connect to. Well, I was able to assign my 3DS a fixed IP address and also log into my router settings and follow the suggested fix by Nintendo to try and resolve the issue. Once I followed the instructions, I was able to get into one town, but still unable to get into others. The fix did say that if you still experience difficulty, you may need to have the person on the other end follow the same instructions you just followed to ensure communications are not blocked, so maybe that's the issue.
Funnily enough, I had issues long time ago with my Animal Crossing Wild World towns and could never communicate via WiFi because an error always occurred when I tried to go out of the gate; we always just used local connections to communicate between towns. With this proposed Animal Crossing New Leaf error fix that was suggested, that issue is now resolved, so I guess I will finally get Blanca to visit my Wild World towns (yes, we still play Wild World too!) -- either way, I'm getting out of a town one way or another!
If you want to view the proposed fix for the Animal Crossing New Leaf 018-0512 error (it may also fix the 018-0511 error), visit the Nintendo Wi-Fi Connection Customer Service page. I still have intermittent issues with visiting some towns after the fix, but hopefully it'll all get worked out eventually. Good luck!