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Error codes

The Knox Guard API uses the conventional HTTP response code to indicate the success or failure of a request. A 2XX response code indicates success, a 4XX response code indicates an error given the inputs of the request, and a 5XX response code indicates a failure with the Knox Guard platform. In addition, errors contain a JSON response body with more information about the error:

HTTP/1.1 200 OK Content-Type: application/json

    "result" : "SUCCESS",
    "requestedId": "111000291332456"

Async result : POST /kcs/v1.1/kg/transaction

HTTP/1.1 200 OK Content-Type: application/json

    "count" : 3,
    "success": 2,
    "fail": 1,
    "resultList": [
            "result": "FAIL",
            "requestedId": "123456789012347"
            "error" : {
                "code" : "4000000",
                "message" : "RESOURCE_INVALID_PARAM",
                "reason" : "RESOURCE_INVALID_PARAM"

HTTP/1.1 401 Unauthorized Content-Type: application/json

    "result" : "FAIL",
    "error" :
        "code": 4010000,
        "message": "AUTHORIZATION_FAIL",
        "reason": "Invalid Api Key"

Error response body

The error response attributes are:

Property Type Required Description
result String Yes SUCCESS/FAIL
error Error Yes Error object

Error object

The error objects contain the following attributes:

Property Type Required Description
code String Yes A Knox Guard defined error code that serves as a more specific indicator of the error than the HTTP response code.
message String Yes A description of the error, intended to aid developers in debugging the error response.
reason String Yes A description of the error, intended to aid developers in debugging the error response.

Standard HTTP error codes

The following table lists the most common HTTP error responses:

Code Name Description
400 Bad Request The client has issued an invalid request. This is commonly used to specify validation errors in a request payload.
401 Unauthorized Authorization for the API is required, but the request has not been authenticated.
403 Forbidden The request has been authenticated but does not have the appropriate permissions, or the requested resource cannot be found.
404 Not Found Specifies that the requested path does not exist.
406 Not Acceptable The client has requested a MIME type via the Accept header for a value not supported by the server.
422 Unprocessable Entity The client has made a valid request, but the server cannot process it. This is often returned for APIs when certain limits have been exceeded.
429 Too Many Requests The client has exceeded the number of requests allowed for a given time window.
500 Internal Server Error An unexpected error on the SmartThings servers has occurred. These errors should be rare.
501 Not Implemented The client request was valid and understood by the server, but the requested feature has yet to be implemented. These errors should be rare.

Knox Guard error codes

Knox Guard specifies several custom error codes which provide more information than the standard HTTP error response codes. The following table lists the standard Knox Guard error codes and their descriptions:

Code Message Description
4010000 AUTHORIZATION_FAIL The API key is not valid or the restriction data does not match.
4002102 API_KEY_RESTRICTION_INVALID The IP address or HTTP referer format is incorrect.
4042101 API_KEY_RESTRICTION_NOT_FOUND The IP address or HTTP referer is empty.
4040100 USER_NOT_FOUND There is no user linked to the API key.
4040900 TENANT_NOT_FOUND There is no tenant linked to the API key.
4000000 RESOURCE_INVALID_PARAM Argument is invalid.
4001809 LICENSE_IS_LACK There are no additional licenses that can be activated.
4040300 DEVICE_NOT_FOUND The specified device was not found.
4000310 DEVICE_STATE_INVALID The operation is not permitted in the current state.
4000316 DEVICE_BULK_OPERATION_LIMIT_EXCEEDED The bulk operation limit has been exceeded.
4040400 PROFILE_NOT_FOUND Internal profile not found.
4001807 LICENSE_MAX_COUNT_REACHED License max count reached.
4001805 LICENSE_NAME_ALREADY_EXISTS License name already exists.
5001804 LICENSE_INTERNAL_SERVER_FAILED Error communicating with the license server.
4001813 LICENSE_KEY_ALREADY_EXISTS_IN_OTHER_REGION License key already registered to another region (EU/US).
4001802 LICENSE_MAX_TRIAL_LICENSE_COUNT_REACHED Max trial license count reached.
4041800 LICENSE_NOT_FOUND License not found.
4001806 LICENSE_DEVICE_MAPPING_FOUND Device already registered with a license.
4001812 LICENSE_ALREADY_DELETED License already deleted.
4030102 USER_IN_INVALID_STATE User state is invalid.
4030107 USER_REJECTED_STATE User is rejected by Samsung Admin.
4030104 USER_BLOCKED_STATE User is blocked by Samsung Admin.
4030106 USER_PENDING_STATE User is not approved yet.

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