PEAK is one of the most fun co-op releases of 2025 and a huge success for Landfall and Aggro Crab, selling over two million copies in just nine days. The developers have been consistent with updates, user feedback, and have confirmed that more content is on the way.
Since the game blew up and is primarily designed with multiplayer, there are bound to be some network and technical issues. If you’re constantly getting stuck on “authenticating” in PEAK, here are a few things you can try to fix that.
Update PEAK
This is a known issue in PEAK, and the developers initially suggested using a VPN to get around the error, especially if you are from Russia or Europe. However, the developers have since resolved the issue on their end, and PEAK should be connecting to the servers as normal.
Since this is a game with constant updates, I recommend putting the update priority in Steam to the highest. This way, PEAK will take priority over your other game updates, so you aren’t playing on an outdated version. Here is how you’re able to do that in the Steam client:
This should fix the problem for most users, but the error might pop up again. In that case, you can try the following suggestions:
Generic Troubleshooting
Apart from that, you can try the following generic network troubleshooting suggestions.
These minor technical issues are expected for a smaller release like this. The developers clearly didn’t anticipate the game blowing up the way it did, and it’s pretty normal for the first few weeks to be unstable.
Ali Hashmi
Ali has been writing about video games for the past six years and is always on the lookout for the next indie game to obsess over and recommend to everyone in sight. When he isn’t spending an unhealthy amount of time in Slay the Spire, he’s probably trying out yet another retro-shooter or playing Dark Souls for the 50th time.
