Nintendo Switch console code 2123-0217: meaning and exact next steps

Model-specific

What is true of this model and not of its siblings

The message

The connection to the server was lost.

First step

Restart the console.

A lost server connection

The on-screen message says that the connection to the server was lost, so the console had a connection and then lost it. That points to a drop, and the usual cure is to restart the console, create a new connection and retry. If the loss happens at the same moment in every attempt, look at the router for a scheduled restart or a power-saving feature.

Wireless and wired

On Wi-Fi, signal strength and interference are the first suspects, and a wired adapter gives the most stable link. Compare the console with another device in the same spot: if the other device also drops, the network is at fault.

Provider outages

A drop at the provider's end affects every device in the home, so check whether the television or a phone on Wi-Fi also loses its connection at the time.

A drop at a repeating moment

Notice when it drops. If the loss comes at the same minute in every session, something scheduled is responsible, such as a router restart, a backup on another device or a provider maintenance window. If it drops at random, signal strength and interference are more likely.

Comparing devices

Stream a video on a phone in the same spot while you play. If the video also stalls, the network is the cause. If it plays smoothly while the console drops, the console's connection settings are worth rebuilding with a new internet connection.

What to record

Note the time of the error, whether other devices in the house were online and whether the game was in the middle of a match or at a menu. A pattern, such as always during a particular stage, helps the game's support as much as Nintendo's.

Server side or home side

If the error appears for several games at once, the cause is probably your connection. If it appears only in one game, the game's servers may be at fault, and the game's own support page or community will usually say so.

Wording of the message

The article lists this code with the message that the connection to the server was lost. The wording matters, because it tells you the console had a connection and lost it, not that it never connected. Look back at what the screen said before the error, which helps decide whether it was a drop or a refusal.

Quiet hours

If the loss happens at the same hour each night, ask whether a backup, an update or a scheduled restart runs on another device or the router then. Moving it to another hour can end the problem.