crowdsecurity/crowdsec · critical

authMiddleware.MiddlewareInit() Error:

Error message

authMiddleware.MiddlewareInit() Error:

What it means

NewJWT constructs the JWT auth middleware and then calls MiddlewareInit() to load/validate its configuration (signing key, discovery, etc.). If initialization fails, the constructor wraps the underlying error with the 'authMiddleware.MiddlewareInit() Error:' prefix and returns a zero-value JWT, so the API server cannot start with JWT auth.

Source

Thrown at pkg/apiserver/middlewares/v1/jwt.go:315

		Timeout:         time.Hour,
		MaxRefresh:      time.Hour,
		IdentityKey:     MachineIDKey,
		PayloadFunc:     PayloadFunc,
		IdentityHandler: IdentityHandler,
		Authenticator:   jwtMiddleware.Authenticator,
		Authorizator:    Authorizator,
		Unauthorized:    Unauthorized,
		TokenLookup:     "header: Authorization, cookie: jwt",
		TokenHeadName:   "Bearer",
		TimeFunc:        time.Now,
	})
	if err != nil {
		return &JWT{}, err
	}

	errInit := ret.MiddlewareInit()
	if errInit != nil {
		return &JWT{}, errors.New("authMiddleware.MiddlewareInit() Error:" + errInit.Error())
	}

	jwtMiddleware.Middleware = ret

	return jwtMiddleware, nil
}

View on GitHub (pinned to 909b515798)

Solutions

1. Generate or set a jwt_secret in the api.server config section (cscli can regenerate it, or copy a known-good config)
2. Inspect the wrapped inner message after the prefix to see the actual init failure
3. Re-run the CrowdSec install/config wizard or restore the config from backup
4. Check file permissions/ownership of the config and secrets directory

Example fix

// before (config.yaml)
api:
  server:
    jwt_secret: ""
// after
api:
  server:
    jwt_secret: "<generated-64-char-random-string>"

// before starting the API server, check the secret exists
if cfg.API.Server.JWTSecret == "" {
    return fmt.Errorf("api.server.jwt_secret is empty; generate one before starting")
}

// startup code
jwt, err := NewJWT(cfg)
if err != nil {
    log.Fatalf("jwt middleware init failed: %v", err)
}

When it happens

Trigger: NewJWT (called from NewMiddlewares at apiserver startup) when MiddlewareInit fails, e.g. the jwt secret in the local API server config is empty/absent or the underlying middleware init returns an error.

Common situations: api section of crowdsec config (dev.yaml / config.yaml) has an empty or missing api.server.jwt_secret; corrupted or hand-edited config file; fresh installs where LAPI secret registration failed.

Understand the failure class

Background: "is required", "must be set", "missing required field": configuration validation errors across open-source libraries — this error's family across 36 libraries.

Related errors

• path must start with /
• basic_auth is selected, but basic_auth is not provided
• basic_auth is selected, but username is not provided
• basic_auth is selected, but password is not provided
• headers is selected, but headers is not provided

AI-assisted analysis of crowdsecurity/crowdsec@909b515798 (2026-09-06). Data as JSON: /api/errors/c0b85debadb7fa79. Report an issue: GitHub.