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    Web Application Firewall:ModifyDefenseRule

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    Web Application Firewall:ModifyDefenseRule

    Last Updated:Jul 13, 2026

    Modifies the configuration of a protection rule.

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    RAM authorization

    The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

    • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

    • API: The API that you can call to perform the action.

    • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

    • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

      • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

      • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

    • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

    • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

    Action

    Access level

    Resource type

    Condition key

    Dependent action

    yundun-waf:ModifyDefenseRule

    update

    *All Resource

    *
    • acs:ResourceGroupId
    		 None

    Request parameters

    Parameter

    Type

    Required

    Description

    Example
    InstanceId

    string

    Yes

    Instance ID of the WAF instance.

    Note

    You can call the DescribeInstance operation to query instance ID of the WAF instance.

    waf_cdnsdf3****
    TemplateId

    integer

    No

    The ID of the protection rule template.

    Note

    This parameter is required only when DefenseType is set to template.

    5325
    DefenseScene

    string

    No

    The protection scenario to modify. For more information, see the DefenseScene parameter in CreateDefenseRule.

    waf_group
    Rules

    string

    Yes

    The details of the protection rule. The value is a string that is generated from a series of parameters in JSON format. When you configure this parameter, specify the rule ID and the protection rule configuration to modify. The following parameters are included:

    • id: Long | Required | The rule ID.

    • Protection rule configuration: Same as the Rules parameter of the CreateDefenseRule operation. For more information, see the protection rule parameter description in CreateDefenseRule.

    [ { "id": 2344, "policyId": 1012, "action": "block" } ]
    DefenseType

    string

    No

    The type of the protection rule.

    Valid values:

    • template :

      (Default) Template-based protection rule.

    • resource :

      Protection object-level rule.

    • global :

      Global-level rule.

    template
    RegionId

    string

    No

    The region where the WAF instance is deployed. Valid values:

    • cn-hangzhou: the Chinese mainland.

    • ap-southeast-1: outside the Chinese mainland.

    cn-hangzhou
    ResourceManagerResourceGroupId

    string

    No

    The ID of the Alibaba Cloud resource group.

    rg-acfm***q
    Resource

    string

    No

    The protected object associated with the rule to modify.

    Note

    This parameter is required only when DefenseType is set to resource.

    rencs***-waf

    Response elements

    Element

    Type

    Description

    Example

    object

    The response.

    RequestId

    string

    The request ID.

    1EEA9C98-F166-54FE-ADE3-08D8****BDFA

    Examples

    Success response

    JSON format

    {
  "RequestId": "1EEA9C98-F166-54FE-ADE3-08D8****BDFA"
}

    Error codes

    HTTP status code

    Error code

    Error message

    Description
    400 Defense.Control.DefenseWhitelistBypassRuleNotExist The whitelist protection rule does not exist. The whitelist protection rule does not exist. Rule ID:%s.
    400 Defense.Control.DefenseWhitelistConfigInvalid The whitelist rule is misconfigured. Error configuring whitelist rule: %s.
    400 Defense.Control.DefenseBookTypeInvalid The address book type is illegal. The address book type is illegal.
    400 Defense.Control.DefenseThreatIntelligenceConfigInvalid Threat Intelligence Rule configuration error. Threat Intelligence Rule configuration error. %s
    400 Defense.Control.DefenseIpCountOversize The number of IPs exceeds the limit. The number of IPs exceeds the limit.

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.