I tried to make a trade few days ago but the player who was suppose to come to my town got the  error message 018-0511.
I changed few things in my 3DS and hope it works now.

Can someone come in my town to see if it works please?

If it doesn't, has anyone had to deal with this problem?

Thank you!!

-Staff Post (1/11/2016 1:11:56 PM)
This post violated the following rule:
2.1 Posting on the Wrong Board

Moving thread from AC Discussion - AC:NL General to Wi-Fi - WiFi Tech Support.

I've never had to deal with this problem, but I have looked up this error code and found this on Nintendo's official support site.

"This error code typically indicates an issue communicating and matchmaking with other players.
This is often caused by network firewalls blocking necessary network traffic.
This can be caused by your network, or the network of the person you are connecting with. If these steps do not resolve your connection issue, have your friend try them as well."