Nintendo Switch NAT Traversal Process Has Failed

I was having this same issue with my switch, I’ll give you 3 potential fixes that might help you.

1. Fully shut down your Nintendo switch and restart it. Occasionally this will refresh internet/ connection settings.
2. If shutting down and restarting the switch doesn't work then it's time to reset your router. Resetting your router to factory settings might fix whatever problem may be happening with the server connection and your internet. Just remember that you'll have to set up the TMobile Internet App again and configure your preferred settings (admin password and router password). It's a bit of a hassle but shouldn't take more than 10 minutes to set up and check if the switch works or not.
3. And finally if the other 2 options fail then time to change the DNS setting on the switch. Go to system settings → internet  → internet settings → select your internet network→  change settings→  DNS SETTINGS switch it from automatic to manual. 
   You will have to enter new DNS settings here Primary and Secondary. The first set of DNS is : -> Primary DNS 008.008.008.008             Secondary DNS 008.008.004.004         If this set of DNS doesn't work for you then try this next set: -> Primary DNS 001.001.001.001               Secondary DNS 001.000.000.001         

I sincerely hope this helps you out good luck. 

We tried all the above steps and it didn't work for us. Any other ideas?

Had this issue with my old switch. Nothing worked. Got a new switch and the wifi worked for all of 3 days then quit now it wont work keeps saying NAT is failing. Ive restarted the switch and router. No issues with any other systems or devices just nintendo switch. 

ErinB6422 wrote:

We tried all the above steps and it didn't work for us. Any other ideas?

did you ever figure this out?

im dealing with the same issue and can't fix it.  Kind of regretting switching to T-Mobile knowing that I won't be able to play super smash online :/ 

I tried all the above steps & nothing worked. 
 

anyone figure anything out to get it to work? This really sucks. I hope T-Mobile can fix this issue.