## PUT /api/v2/vps/{id}/firewall/options

**Update VPS firewall options**

Partially update inbound VPS firewall options. Send at least one of `enabled` or `inboundPolicy`; unknown fields are rejected. Public v2 firewall management is inbound-only; use `POST /api/v2/vps/{id}/firewall` for inbound allow rules. To turn protection on for inbound traffic, set `enabled: true` and usually `inboundPolicy: "DROP"`, then add explicit allow rules.

### Related Endpoints

- `GET /api/v2/vps/{id}/firewall/options`: Get VPS firewall options
- `GET /api/v2/vps/{id}/firewall`: List VPS firewall rules
- `POST /api/v2/vps/{id}/firewall`: Add VPS firewall rule

### Headers

- `Accept`: application/json
- `Authorization`: Bearer YOUR_API_KEY
- Required API scope: `write:vm`
- `Content-Type`: application/json

### Parameters

- `id` (path, string, required): Public VPS ID from `GET /api/v2/vps` `data[].id`. Do not invent this value; use the exact ID returned by the referenced API response. Example: `vps_01hxa3b4c5d6e7f8g9h0j1k2m3`

### Request Body

- `enabled` (boolean, optional) Example: `true`
- `inboundPolicy` (string, optional) Example: `DROP`
  Allowed values: ACCEPT, DROP, REJECT

### Request Examples

#### Enable inbound filtering

```bash
curl -X PUT "https://cloud.hostup.se/api/v2/vps/vps_01hxa3b4c5d6e7f8g9h0j1k2m3/firewall/options" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "enabled": true,
    "inboundPolicy": "DROP"
  }'
```

```json
{
  "enabled": true,
  "inboundPolicy": "DROP"
}
```

### Response Schema

- `enabled` (boolean, required) Example: `true`
- `inboundPolicy` (string, required) Example: `DROP`
  Allowed values: ACCEPT, DROP, REJECT
- `platformFilteringInbound` (boolean, required) Example: `true`
- `available` (boolean, required) Example: `true`
- `reason` (string,null, required) Example: `null`
- `source` (string,null, required) Example: `live`
- `mode` (string,null, required) Example: `enabled_restrictive`
- `summary` (string,null, required) Example: `Firewall protection is on. Incoming traffic must match an allow rule to pass.`
- `detail` (string,null, required) Example: `Traffic that does not match an allow rule is blocked before it reaches the VM.`
- `actions` (object, required)
- `actions.canUpdate` (object, required)
- `actions.canUpdate.allowed` (boolean, required) Example: `true`
- `actions.canUpdate.reason` (string,null, required) Example: `null`
- `actions.canUpdate.code` (string,null, optional): Machine-readable reason code when an action is blocked. Example: `pending_order`

### Responses

#### 200 - Firewall options updated.
```json
{
  "enabled": true,
  "inboundPolicy": "DROP",
  "platformFilteringInbound": true,
  "available": true,
  "reason": null,
  "source": "live",
  "mode": "enabled_restrictive",
  "summary": "Firewall protection is on. Incoming traffic must match an allow rule to pass.",
  "detail": "Traffic that does not match an allow rule is blocked before it reaches the VM.",
  "actions": {
    "canUpdate": {
      "allowed": true,
      "reason": null
    }
  }
}
```

#### 400 - Invalid request. The response body is an RFC 7807 Problem Details document.
```json
{
  "type": "https://developer.hostup.se/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "detail": "The request body failed validation.",
  "code": "invalid_request",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z",
  "errors": [
    {
      "pointer": "/items/0/domainName",
      "detail": "`domainName` is required.",
      "code": "invalid_request"
    }
  ]
}
```

#### 401 - Unauthorized. Authentication is required.
```json
{
  "type": "https://developer.hostup.se/errors/unauthorized",
  "title": "Unauthorized",
  "status": 401,
  "detail": "Authentication is required.",
  "code": "unauthorized",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 403 - Forbidden. The caller lacks a required scope or does not own the resource.
```json
{
  "type": "https://developer.hostup.se/errors/forbidden",
  "title": "Forbidden",
  "status": 403,
  "detail": "The caller lacks a required scope or does not own the resource.",
  "code": "forbidden",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 404 - Not found. The resource does not exist or is not owned by the caller.
```json
{
  "type": "https://developer.hostup.se/errors/not_found",
  "title": "Not found",
  "status": 404,
  "detail": "The requested resource could not be found.",
  "code": "not_found",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 429 - Rate limited. Retry after the limit resets. 429 responses include `Retry-After` seconds plus `X-RateLimit-*` headers.
```json
{
  "type": "https://developer.hostup.se/errors/rate_limit_exceeded",
  "title": "Too many requests",
  "status": 429,
  "detail": "Too many requests. Retry after the limit resets.",
  "code": "rate_limit_exceeded",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 500 - Internal error. Retry later or contact support if the issue persists.
```json
{
  "type": "https://developer.hostup.se/errors/internal_error",
  "title": "Internal server error",
  "status": 500,
  "detail": "An unexpected error occurred. Retry later or contact support if the issue persists.",
  "code": "internal_error",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```