Backend error -1 appears sporadically

Issue Type (Required):

Error - Backend Error

Issue Description (Required):

[Backend Error -1] appears seemingly at random. It predominantly occurs, on launch, when an item is crafted, a mission is started, or right when a mission is declared failed or victorious (which I guess happens just before it registers because I won’t get anything from the mission on victory rip). Sometimes I can go 4 games in a row without it appearing but it always crops up eventually. This has been happening from the first day I got the game (a couple weeks ago), I like the game in spite of it but it’s been one time too many. I first thought it just happened whenever I would first do a mission and it would eventually go away, but that has been proven false.

[PC] Do You Use Mods? (Optional):

No, I don’t use mods

Reproduction Rate (Required):

Often (<75%)

Platform (Required):

Steam (PC)

Player ID (Optional):

[PC] Crash Report (Optional):

The trouble is that it never opens that information box. I included the most recent console log when it happened on boot up (02.43.41) and one before when it appeared on mission fail (02.05.47).

Upload Supporting Evidence (Optional):

[PC] Upload Console Log & vermintide2_launcher.log (Optional):

console-2026-08-01-02.43.41-6d43e7f2-aa6d-4cf0-adcf-44c6dce5a5b5.log (99.1 KB)console-2026-08-01-02.05.47-6ab90c52-0bb0-41dd-bc0b-7a9326915805.log (282 KB)

Can confirm I just received this as well today as host.

console-2026-08-01-02.03.43-3a3c3618-317f-4873-acde-62f6bf3ec2ba.log (1.3 MB)

The clan Fester infiltration of Stockholm has succeeded, they are destroying the source

Just bought the game and I’m getting this every time I try to play. :face_with_spiral_eyes:

This error just started occurring for everyone in my group, everyone else that I know is playing, and several people have mentioned the same error in the official discord.

rip you too huh :confused:

Not sure if you were able to find a work-around and/or heard any update from devs.

I set graphics specs to medium on the launcher pop-up(instead of custom/maxed out) and it seemed to get me into the lobby hub. Once in the hub just re-adjust your settings which is tedious.

No haven’t heard anything yet. I get theme at on launch but also at the start and end of a mission which is the problem. it’s like a coin toss whenever I do a thing. Idk why graphics would be the issue but may as well try other settings

Hi all, our Vermintide 2 backend developer is currently on vacation, but I’ll share your reports and logs with them. Once they return, they may be able to share some insight.

The error may be occurring due to connection with the backend being interrupted or failing. Our connectivity solutions may be of help, here:
https://support.fatshark.se/hc/en-us/articles/360034654113-How-to-Resolve-Connectivity-Errors-Latency-Issues-in-Vermintide-2

Thank You, I’ll start going through those.

no dice so far

Sorry to hear that. I’ve now spoken with our backend developers and after reviewing the logs they informed me that:

  • One log includes an unusual issue on our backend service provider’s end. We received unexpected data when calling their API and received a ‘500 Internal Server Error’. Unfortunately, this isn’t something we can resolve and is down to instability from our service provider
  • Two other logs contained an error ‘PEER_FAILED_VERIFICATION’ after making requests to the backend. This means that client did not trust the SSL Cert issued by our backend service provider’s servers. This could be a symptom of:
  1. Incorrect system time (date and time of client is not correct)
  2. The server is using old/incorrect certification - which is unlikely otherwise all players would encounter this issue
  3. Client/ISP is trying to eavesdrop on the conversation/requests
  4. Client network problems resulting in corrupt/lost data packages or similar

Regrettably, as the issues appear to be with either our backend service provider, or client side, there isn’t anything specific that we can do on our end :frowning:

For a little context, I was playing on an older PC for years that gave me the error just before the devs vacation. During dev time off I purchased a new PC and received the same backend service error after a fresh re-install(new bootup new windows new everything). I assumed it was my internet and wi-fi but my knowledge in how the systems works is extremely elementary.

Any info I can provide please let me know. I will attempt to play this weekend and update with console logs if it happens again.