I know how you feel, Shen. I'm slowly starting to lose my grip in the game and I am playing less and less by the lobbies.
I can't even get into a match anymore because of the connection errors. They happen 80 percent of the time, now.
Um... if you're getting connection errors, check your connection. That doesn't have anything to do with Con2.
If you're getting 86420 you need to set up DMZ.
What's a DMZ?
Wikipedia didn't help.
DMZ is Demilitarized Zone. It essentially means removal of the protections that your router provides for a specific device connected to your home network. Setting up your Wii as DMZ will make your connectivity better for sure, and unless you use your Wii to store credit card information or something sensitive, you're not really putting anything at risk.
I can help you with the DMZ stuff if you want, or at least point you to some helpful information. Maybe this should be a thread all by itself.
Also, you might try just unplugging your router and plugging it back in. Mine needs a restart now and then.
Also... Give your Wii a reboot, and also go into the settings and disconnect it from the router then reconnect it.
Does any of this make sense?
The Wii Shooter Unleashed! Wooof! Wooof! Conduit2FC(36): 3354-2948-5226, (38): 4814-7986-3261