After investigating this particular issue thoroughly, it turns out that there are several different scenarios that might spawn this particular error code. Here’s a list of potential culprits: Now that you know every potential culprit, here’s a list of fixes that other affected users have successfully used to fix the issue in their case:
Method 1: Changing the DNS Settings
Keep in mind that Nintendo has decided to block NAT type D (Closed) for years now and NAT type C is also known to cause a lot of underlying issues with P2P games like Splatoon 2. If you are stuck with a NAT type D or C and there are no ways around it, one solution that might allow you to bypass the Switch Error Code 2618-0516 (NAT Traversal Process Has Failed) error is to modify the current DNS settings in order to allow P2P games to function without issues. A lot of affected users have repotted this particular fix to be effective in situations where they were encountering this issue only when connected to a restricted college/work/public network. In case this scenario looks like it could be applicable, follow the instructions below to change the default DNS settings on your Nintendo Switch console: If this scenario is not applicable or you already follow the steps above and you’re still encountering the same error message, move down to the next potential fix below.
Method 2: Refreshing TCP / IP Cached Data
If changing the DNS settings didn’t work in your case, your next step should be to troubleshoot the second most common cause for this type of inconsistency (TCP or IP related) that’s inhibiting your Switch’s ability to communicate to the online server. In case this scenario is applicable, you have 2 different ways of fixing this issue:
Resetting your routerRebooting your router
If you didn’t try this potential fix yet, start by pressing the power button on the back of your router to turn it off, then physically unplug the power cable and keep it unplugged for a full minute in order to ensure that the power capacitors are completely drained. Once this period has passed, reconnect the power cable and press the power button once again to start the network device back up. In case the Switch Error Code 2618-0516 (NAT Traversal Process Has Failed) is still not resolved, you should move forward to a router reset procedure. However, before going this to your router it’s important to understand that this operation will end up resetting the custom settings that you previously established including PPPoE credentials, forwarded ports, blacklisted devices, etc. If you understand the consequences and you want to go forward with this procedure, you will need a sharp object (needle, small screwdriver, or toothpick) in order to reset your router. This is necessary because, in the vast majority of cases, the reset button is built-in in order to prevent accidental presses. Once you’re ready, press and hold the reset button for about 10 seconds or until you see all the front LED’s flashing at the same time. After the reset procedure is complete, re-establish your internet connection and see if the issue is fixed. Note: If your ISP is using PPPoE, you will need to reinsert the credentials supplied by them first. In case the Switch Error Code 2618-0516 (NAT Traversal Process Has Failed) error is still occurring, move back to the next potential fix below.
Method 3: Contacting the ISP
If none of the methods above have worked for you and you’re encountering this issue with every action that requires you to connect to a multiplayer component, you might be dealing with an ISP that uses private IP addresses which might facilitate the usage of NAT type C. If that’s the case, the only thing you can do in order to fix the issue is to get in contact with your ISP and ask them to provide you with a public IP. This is fairly common with European ISPs that are at the forefront of enforcing policies to protect the user’s anonymity. If you suspect that you might be dealing with this issue, here’s a short guide that will walk you through the process of discovering their NAT type of your Nintendo Switch:
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