After updating to 3.6 the mod downloader is not working for me.
Downgrading back to 3.5 resolves the issue.
I also tried removing ValheimPlus.dll to see if that was the issue - but the non-URL mods are causing the error too. See at the bottom of the log.
services:
valheim:
image: mbround18/valheim:latest
stop_signal: SIGINT
ports:
- "2456:2456/udp"
- "2457:2457/udp"
- "2458:2458/udp"
environment:
TYPE: "BepInEx"
PORT: 2456
NAME: "Blobs Server"
WORLD: "Dedicated"
PASSWORD: "REDACTED"
TZ: "Europe/London"
PUBLIC: 0
PRESET: "normal"
MODIFIERS: "combat=veryeasy,deathpenalty=casual,resources=most,portals=casual"
MODS: |
"https://github.com/Grantapher/ValheimPlus/releases/download/0.9.17.1/ValheimPlus.dll"
"ValheimModding-JsonDotNET-13.0.4"
"ValheimModding-Jotunn-2.27.1"
"OdinPlus-OdinArchitect-1.6.5"
"RandyKnapp-EpicLoot-0.12.10"
"Azumatt-AzuCraftyBoxes-1.8.13"
volumes:
- /dockervol/valheim/saves:/home/steam/.config/unity3d/IronGate/Valheim
- /dockervol/valheim/server:/home/steam/valheim
valheim-1 | INFO odin: Valheim Server - Fri Feb 20 09:47:44 AM GMT 2026
valheim-1 | INFO odin: Initializing your container...
valheim-1 | INFO odin: Runtime user: steam
valheim-1 | INFO odin: Runtime uid: 111
valheim-1 | INFO odin: Runtime gid: 1000
valheim-1 | INFO odin: Steam uid: 111
valheim-1 | INFO odin: Steam gid: 1000
valheim-1 | (standard_in) 1: syntax error
valheim-1 | INFO odin: [Valheim] Total memory: 31i GB
valheim-1 | INFO odin: [Valheim] Setting up file systems
valheim-1 | usermod: no changes
valheim-1 | INFO odin: [Valheim] Navigating to steam home...
valheim-1 | INFO odin: [Valheim] Launching server...
valheim-1 | INFO odin: [Valheim] -------------------------------------------------------------
valheim-1 | INFO odin: [Valheim] Valheim Server - Fri Feb 20 09:47:51 AM GMT 2026
valheim-1 | INFO odin: [Valheim] STEAM_UID 111 - STEAM_GID 1000
valheim-1 | INFO odin: [Valheim] Installing Valheim via odin 2.1.0...
valheim-1 | INFO odin: [Valheim] -------------------------------------------------------------
valheim-1 | INFO odin: [Valheim] Variables loaded.....
valheim-1 | INFO odin: [Valheim] Port: 2456
valheim-1 | INFO odin: [Valheim] Name: Blobs Server
valheim-1 | INFO odin: [Valheim] World: Dedicated
valheim-1 | INFO odin: [Valheim] Public: 0
valheim-1 | INFO odin: [Valheim] With Crossplay: 0
valheim-1 | INFO odin: [Valheim] Password: (REDACTED)
valheim-1 | INFO odin: [Valheim] Preset: normal
valheim-1 | INFO odin: [Valheim] Modifiers: combat=veryeasy,deathpenalty=casual,resources=most,portals=casual
valheim-1 | INFO odin: [Valheim] Set Key:
valheim-1 | INFO odin: [Valheim] Has Webhook: false
valheim-1 | INFO odin: [Valheim] Auto Update: 0
valheim-1 | INFO odin: [Valheim] Auto Backup: 0
valheim-1 | INFO odin: [Valheim] Auto Backup On Update: 0
valheim-1 | INFO odin: [Valheim] Auto Backup On Shutdown: 0
valheim-1 | INFO odin: [Valheim] Auto Backup Pause With No Players: 0
valheim-1 | INFO odin: [Valheim] Auto Backup Remove Old: 1
valheim-1 | INFO odin: [Valheim] Auto Backup Days To Live: 3
valheim-1 | INFO odin: [Valheim] Auto Backup Nice Level:
valheim-1 | INFO odin: [Valheim] Update On Startup: 1
valheim-1 | INFO odin: [Valheim] Mods: "https://github.com/Grantapher/ValheimPlus/releases/download/0.9.17.1/ValheimPlus.dll"
valheim-1 | "ValheimModding-JsonDotNET-13.0.4"
valheim-1 | "ValheimModding-Jotunn-2.27.1"
valheim-1 | "OdinPlus-OdinArchitect-1.6.5"
valheim-1 | "RandyKnapp-EpicLoot-0.12.10"
valheim-1 | "Azumatt-AzuCraftyBoxes-1.8.13"
valheim-1 |
valheim-1 | INFO odin: [Valheim] -------------------------------------------------------------
valheim-1 | INFO odin: [Valheim] Running Install...
valheim-1 | DEBUG odin: Current Directory: /home/steam/valheim
valheim-1 | DEBUG odin: Current User: steam
valheim-1 | DEBUG odin: Current UID: 111
valheim-1 | DEBUG odin: Current GID: 1000
valheim-1 | DEBUG odin: Home Directory: /home/steam
valheim-1 | 2026-02-20T09:47:51.263263Z INFO odin::server::install: Preflight: system and filesystem summary...
valheim-1 | 2026-02-20T09:47:51.264875Z WARN odin::server::install: Perms /: drwxr-xr-x (0o755), owner=0:0, class=other, read=yes, write=no
valheim-1 | 2026-02-20T09:47:51.265384Z INFO odin::server::install: Current build: unknown (manifest not found)
valheim-1 | 2026-02-20T09:47:51.265389Z INFO odin::server::install: Installing using default/stable branch
valheim-1 | 2026-02-20T09:47:51.265391Z INFO odin::server::install: Installing 896660 to /home/steam/valheim
valheim-1 | 2026-02-20T09:47:51.265445Z INFO odin::steamcmd: steamcmd found in path
valheim-1 | Redirecting stderr to '/home/steam/.steam/steam/logs/stderr.txt'
valheim-1 | Logging directory: '/home/steam/.steam/steam/logs'
valheim-1 | [ 0%] Checking for available updates...
valheim-1 | [----] Verifying installation...
valheim-1 | UpdateUI: skip show logo
valheim-1 | Steam Console Client (c) Valve Corporation - version 1769026246
valheim-1 | -- type 'quit' to exit --
valheim-1 | Loading Steam API...OK
valheim-1 | "@NoPromptForPassword" = "1"
valheim-1 | "@ShutdownOnFailedCommand" = "1"
valheim-1 | "@sSteamCmdForcePlatformType" = "linux"
valheim-1 | "@sSteamCmdForcePlatformBitness" = "64"
valheim-1 |
valheim-1 | Connecting anonymously to Steam Public...OK
valheim-1 | Waiting for client config...OK
valheim-1 | Waiting for user info...OK
valheim-1 | Update state (0x1) running, progress: 0.00 (0 / 0)
valheim-1 | Update state (0x61) downloading, progress: 11.77 (206722444 / 1756871901)
valheim-1 | Update state (0x61) downloading, progress: 29.06 (510556665 / 1756871901)
valheim-1 | Update state (0x61) downloading, progress: 43.11 (757343342 / 1756871901)
valheim-1 | Update state (0x61) downloading, progress: 56.18 (986967831 / 1756871901)
valheim-1 | Update state (0x61) downloading, progress: 67.78 (1190770859 / 1756871901)
valheim-1 | Update state (0x61) downloading, progress: 81.11 (1425022394 / 1756871901)
valheim-1 | Update state (0x61) downloading, progress: 95.33 (1674862009 / 1756871901)
valheim-1 | Update state (0x81) verifying update, progress: 32.80 (576269639 / 1756871901)
valheim-1 | Update state (0x101) committing, progress: 99.41 (1746484193 / 1756871901)
valheim-1 | Update state (0x0) unknown, progress: 0.00 (0 / 0)
valheim-1 | Success! App '896660' fully installed.
valheim-1 | Unloading Steam API...OK
valheim-1 | 2026-02-20T09:48:20.577530Z INFO odin::server::install: Installed to build 21981590 (stable)
valheim-1 | 2026-02-20T09:48:20.577553Z INFO odin::executable: Successfully installed Valheim!
valheim-1 | INFO odin: [Valheim] Initializing Variables....
valheim-1 | 2026-02-20T09:48:20.589496Z INFO odin::commands::configure: Checking directory permissions: "/home/steam/valheim"
valheim-1 | 2026-02-20T09:48:20.589516Z INFO odin::commands::configure: Checking directory permissions: "/home/steam/scripts"
valheim-1 | 2026-02-20T09:48:20.589524Z INFO odin::commands::configure: Checking file permissions: "/home/steam/.bashrc"
valheim-1 | 2026-02-20T09:48:20.589784Z INFO odin::files: Successfully written /home/steam/valheim/config.json
valheim-1 | 2026-02-20T09:48:20.589952Z INFO odin::files: Successfully written /home/steam/valheim/discord.json
valheim-1 | INFO odin: [Valheim] Checking for TYPE flag
valheim-1 | INFO odin: [Valheim] Found Type BepInEx
valheim-1 | INFO odin: [Valheim] Running with BepInEx Valheim <3
valheim-1 | INFO odin: [Valheim] Installing BepInEx
valheim-1 | INFO odin: [Valheim] Fetching BepInEx download URL...
valheim-1 | INFO odin: [Valheim] BepInEx Releases URL: https://thunderstore.io/api/experimental/package/denikson/BepInExPack_Valheim/
valheim-1 | % Total % Received % Xferd Average Speed Time Time Time Current
valheim-1 | Dload Upload Total Spent Left Speed
100 1171 100 1171 0 0 10840 0 --:--:-- --:--:-- --:--:-- 10943
valheim-1 | INFO odin: [Valheim] Pulling BepInEx from https://thunderstore.io/package/download/denikson/BepInExPack_Valheim/5.4.2333/
valheim-1 | 2026-02-20T09:48:20.744133Z INFO odin::commands::install_mod: Installing https://thunderstore.io/package/download/denikson/BepInExPack_Valheim/5.4.2333/
valheim-1 | 2026-02-20T09:48:21.148558Z INFO odin::mods::valheim_mod: Installing Framework...
valheim-1 | INFO odin: [Valheim] Installing mods from MODS env via Odin
valheim-1 | 2026-02-20T09:48:21.168070Z INFO odin::commands::install_mod: Installing 6 mod(s) from MODS env
valheim-1 | 2026-02-20T09:48:21.168400Z ERROR odin::commands::install_mod: Failed to process mod(s): Invalid Valheim mod URL
Hi,
After updating to 3.6 the mod downloader is not working for me.
Downgrading back to 3.5 resolves the issue.
I also tried removing ValheimPlus.dll to see if that was the issue - but the non-URL mods are causing the error too. See at the bottom of the log.
Here is my docker-compose.yml: