"License signature failed for license" when moving container to new server

[tophneal]

Due to some performance issues, DM and I decided to try moving the FVTT container to a new server to live all on its own and be unbothered by other services.

Migration of all the container data seemed to go well, but when I start the container, I keep getting an error "License signature Failed for license [redacted]". When I load the app in a browser, I get directed to the License Agreement page. I click the things to consent, and get directed to the page to input my license key. When the page loads and when I input the key, I get the same error in the UI.

So far, I've tried removing the license.json, and incrementing the version number in it all the way up to 14.365 (current version in use.) These efforts have garnered no traction.

In case it helps, these are the logs for the container:

Entrypoint | 2026-08-10 17:56:10 | [warn] The environment variable "TIMEZONE" is deprecated and will be ignored.

Entrypoint | 2026-08-10 17:56:10 | [info] Starting felddy/foundryvtt container v14.365.0

Entrypoint | 2026-08-10 17:56:10 | [info] No Foundry Virtual Tabletop installation detected.

Entrypoint | 2026-08-10 17:56:10 | [info] Using FOUNDRY_USERNAME and FOUNDRY_PASSWORD to authenticate.

Authenticate | 2026-08-10 17:56:10 | [info] Requesting CSRF tokens from https://foundryvtt.com

Authenticate | 2026-08-10 17:56:10 | [info] Logging in as: [redacted]

Authenticate | 2026-08-10 17:56:11 | [info] Successfully logged in as: [redacted]

Entrypoint | 2026-08-10 17:56:11 | [info] Using authenticated credentials to fetch release URL.

ReleaseURL | 2026-08-10 17:56:11 | [info] Fetching presigned release URL for build 365...

Entrypoint | 2026-08-10 17:56:12 | [info] Using CONTAINER_CACHE: /data/container_cache

Entrypoint | 2026-08-10 17:56:12 | [info] Downloading Foundry Virtual Tabletop release.

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

Entrypoint | 2026-08-10 17:56:12 | [info] Installing Foundry Virtual Tabletop 14.365

Entrypoint | 2026-08-10 17:56:17 | [info] Preserving release archive file in cache.

Entrypoint | 2026-08-10 17:56:17 | [info] Cleaning up cache directory: /data/container_cache

Entrypoint | 2026-08-10 17:56:17 | [info] Keeping 1 latest versions.

Entrypoint | 2026-08-10 17:56:17 | [info] No cache cleanup was necessary.

Entrypoint | 2026-08-10 17:56:17 | [info] Not modifying existing installation license key.

Entrypoint | 2026-08-10 17:56:17 | [info] Starting launcher.

Launcher | 2026-08-10 17:56:17 | [info] Generating options.json file.

Launcher | 2026-08-10 17:56:17 | [info] Setting 'Admin Access Key'.

Launcher | 2026-08-10 17:56:17 | [info] Starting Foundry Virtual Tabletop.

FoundryVTT | 2026-08-10 17:56:18 | [info] Running on Node.js - Version 24.18.0

FoundryVTT | 2026-08-10 17:56:18 | [info] Foundry Virtual Tabletop - Version 14 Build 365

FoundryVTT | 2026-08-10 17:56:18 | [info] User Data Directory - "/data"

FoundryVTT | 2026-08-10 17:56:18 | [info] Application Options:

{

  "awsConfig": null,

  "compressSocket": true,

  "compressStatic": true,

  "cssTheme": "dark",

  "deleteNEDB": false,

  "fullscreen": false,

  "hostname": "[redacted]",

  "hotReload": false,

  "language": "en.core",

  "localHostname": "fvtt.truenas",

  "passwordSalt": null,

  "port": 30000,

  "protocol": null,

  "proxyPort": null,

  "proxySSL": false,

  "routePrefix": null,

  "serviceConfig": null,

  "sslCert": null,

  "sslKey": null,

  "tempDir": null,

  "unixSocket": null,

  "updateChannel": "stable",

  "upnp": false,

  "upnpLeaseDuration": null,

  "world": null,

  "adminPassword": "••••••••••••••••",

  "noBackups": false

}

FoundryVTT | 2026-08-10 17:56:18 | [warn] Software license requires signature.

FoundryVTT | 2026-08-10 17:56:18 | [info] Server started and listening on port 30000

FoundryVTT | 2026-08-10 17:56:20 | [info] Created client session 8207a679608fe82f2b489c53

FoundryVTT | 2026-08-10 17:56:25 | [info] Created client session 61f1d84864f96e2a82685fe4

FoundryVTT | 2026-08-10 17:56:26 | [error] Invalid signature file for protected module "dnd-dungeon-masters-guide"

FoundryVTT | 2026-08-10 17:56:26 | [error] Invalid signature file for protected module "dnd-monster-manual"

FoundryVTT | 2026-08-10 17:56:26 | [error] Invalid signature file for protected module "dnd-tashas-cauldron"

FoundryVTT | 2026-08-10 17:56:26 | [error] Invalid signature file for protected module "underworld-races-and-classes"

FoundryVTT | 2026-08-10 17:56:31 | [error] License signature failed for license [redacted]

Any help is greatly appreciated, and I'm happy to provide more info about the new server setup if it will be helpful.

[tophneal]

Per the suggestion from comment from Sharyar Naseem (maybe it's awaiting moderation? can't see it here) I have just tried setting the hostname in Network and FOUNDRY_LOCAL_HOSTNAME to match the original container, I removed the license.json file, and recreated the container.

Though the inspection page for the container (Portainer) does reflect the changes, the same issue persists. When loading the app page, I'm directed to agree to the EULA, then input the license key, and then I get the error that license signature failed.