Understanding Network Issues

Experiencing lag, desync, or connection issues in Valheim? This guide explains the game's unique networking architecture and provides practical solutions for common problems.

Crossplay Networking Considerations

To get started, here's some valuable information to consider about crossplay functionality in Valheim.

Caution

The Valheim wiki states: "Crossplay has a major disadvantage: players on a Crossplay server are more likely to experience lag, timeouts and disconnects. The extra hop of a relay server increases latency and decreases reliability. It also makes connectivity more geographically-sensitive."

Instead of direct server connections, crossplay routes everything through Microsoft's PlayFab relay infrastructure. This additional network hop compounds latency issues, especially when combined with Valheim's distributed authority system. Players farther from relay servers suffer exponentially - their already higher latency affects not just them but everyone in their controlled zones.

Crossplay should only be enabled when you need cross-platform connectivity. If your group plays exclusively on Steam, keeping crossplay disabled provides noticeably better connection stability in most cases.

PlayFab Errors

These are common Microsoft PlayFab errors you may encounter when using crossplay.

Error Code	Description	Solution
`4098`	Invalid handle	Network or PlayFab connection issue. Try disabling crossplay, restarting your router, or reconnecting.
`4133`	Network endpoint limit reached	Wait for the PlayFab network to clear up, disable crossplay, or try staggering concurrent player connections.

Understanding Valheim's Distributed Game Logic

Note

A Valheim developer explained the architecture clearly:

"A common misconception is that the game uses some kind of P2P network. It does not, all data is sent between client<->server and never between clients. However game logic is somewhat distributed and run on the game clients rather than on the server."

Here's how it actually works - when you're alone in an area, your client controls all creatures and objects in that zone, syncing changes to the server. When another player enters your area, you remain in control of most objects. Only when you leave does control transfer to them. This system offloads heavy physics calculations from the server to clients, but creates a critical dependency: if the controlling player has high ping, everyone in that area experiences their lag, regardless of their own connection quality.

The developer acknowledges this sensitivity:

"If player-A is controlling the monsters in the area has high ping to the server then player-B will also notice this, even though player-B has a perfectly fine connection to the server."

This isn't a bug - it's an architectural trade-off that enables Valheim's physics-rich gameplay without requiring massive server-side resources.

Source: Richard Svensson, CEO of IronGate Studios, via a Steam Community thread

The Region Authority Problem

When performance issues occur, identifying the region authority (the player controlling that area) becomes crucial. The symptoms are consistent: delayed interactions, stuttering enemy movements, slow building destruction. Since authority transfers only when the controlling player leaves the area, a simple fix exists - have them briefly exit and re-enter to force reassignment to another player.

This distributed model explains why server hardware upgrades rarely solve lag issues. The bottleneck isn't server CPU or RAM - it's the network path between the controlling client and server. One player's unstable connection becomes everyone's problem when they hold authority over a busy area.

Recognizing Desync

Desync manifests when client and server states diverge while maintaining the appearance of connection. Actions complete client-side but don't persist server-side. In multiplayer, players will witness different realities - one may see enemies dead while another dodges their attacks.

The distributed authority system makes desync particularly problematic. The controlling client might be properly synced while other players in the zone experience state mismatches. Quick reconnection remains the most reliable solution when you notice symptoms like non-persistent inventory changes or conflicting world states between players.

Common Networking Issues

Issue	What's Happening	Solution
Crossplay Lag	Microsoft's relay servers add extra latency in most cases	Disable crossplay if cross-platform play isn't needed.
Zone Authority Lag	A player with connectivity issues is controlling the area	Ensure the in-game zone leader has a known good connection to the server.
Desync	The game shows different things to different players	Reconnect to the server.
Connection Timeouts	Network issues between you and the server	As a quick test, restart your router or try mobile data, and consider following the steps below to further narrow down the problem. Refer to the steps below if crossplay is enabled.

Practical Implications

The distributed architecture means traditional server optimization has a limited impact. Upgrading server hardware won't fix authority-related lag, and these same issues can occur on even the latest gaming hardware. Network path quality between the controlling client and server determines area performance.

For optimal gameplay, players with stable, low-latency connections should enter new areas first to claim authority. On PC, while connected to your server you can press the F2 key to display your basic connection information.

Understanding these mechanics transforms troubleshooting from guesswork to targeted solutions. The system's sensitivity to individual connections isn't a flaw to fix but a current reality to manage.

Solutions

With Crossplay Enabled

If your server has crossplay enabled, try these solutions:

Disable crossplay - If your players are on Steam and you don't require cross-platform connectivity, we highly recommend disabling crossplay. You can turn it off yourself in Settings, then restart your server about 15 minutes later so it re-registers with the Microsoft servers. See our Valheim Crossplay Guide. Until it has re-registered the server may be temporarily inaccessible, so restart your game, wait and try again, or contact a bro on Discord if it still won't connect.
Check for PlayFab errors - Review your server log for specific PlayFab error codes.
Have a player with a known good connection lead your group.
Restart device and router - A simple restart can potentially resolve temporary network issues.
Wait and try again, or try a different location - The PlayFab network may simply be experiencing intermittent congestion related issues. Trying again later or testing a different server location may resolve the issue. Refer to our Change Server Location Guide. If the issues are local, a different general location may resolve them.

With Crossplay Disabled

If your server has crossplay disabled, try these solutions:

Restart device and router - A simple restart can potentially resolve temporary network issues.
Have a player with a known good connection lead your group.
For PC-only servers, consider installing a mod such as Better Networking - See our installing mods guide.
More Information - Have an affected player run an MTR test following our General Network Troubleshooting Guide, and attach the results in a support ticket, our team will review your results to determine the best course of action to get you back into the action ASAP.

Need a second opinion? Contact a bro and we'll provide expert support for the troubleshooting process. Discord