> ## Documentation Index > Fetch the complete documentation index at: https://docs.phala.com/llms.txt > Use this file to discover all available pages before exploring further. # Diagnose custom domain DNS > Verify DNS records for custom domain configuration. Checks CNAME pointing to CVM, TXT records for app verification, and CAA records. ## OpenAPI ````yaml /openapi.json post /api/v1/cvms/{cvm_id}/customize-domain-diagnose openapi: 3.1.0 info: title: Phala Cloud API version: 0.1.0 servers: - url: https://cloud-api.phala.com security: [] tags: - name: CVMs description: Confidential Virtual Machine (CVM) lifecycle management on Phala Network - name: Apps description: App template management and CVM deployment from app blueprints - name: Webhooks description: Manage webhook endpoints and monitor delivery history - name: SSH Keys description: SSH public key management for CVM access - name: KMS description: >- Key Management Service — key derivation, on-chain anchoring, and inspection - name: Instance Types description: Available hardware configurations for CVM deployment - name: Attestations description: Remote attestation and TEE verification endpoints paths: /api/v1/cvms/{cvm_id}/customize-domain-diagnose: post: tags: - CVMs summary: Diagnose custom domain DNS description: >- Verify DNS records for custom domain configuration. Checks CNAME pointing to CVM, TXT records for app verification, and CAA records. operationId: >- diagnose_custom_domains_api_v1_cvms__cvm_id__customize_domain_diagnose_post parameters: - name: cvm_id in: path required: true schema: type: string title: Cvm Id requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/DiagnoseDomainsRequest' responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/DiagnosisResponse' '400': description: Invalid request or multiple CVMs with same name '401': description: Not authenticated '403': description: No access to this CVM '404': description: CVM not found '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' components: schemas: DiagnoseDomainsRequest: properties: domains: items: $ref: '#/components/schemas/DomainCheckRequest' type: array title: Domains description: List of domain and port pairs to check type: object required: - domains title: DiagnoseDomainsRequest description: Request for diagnosing custom domain DNS configuration. DiagnosisResponse: properties: results: items: $ref: '#/components/schemas/DomainDiagnosisResult' type: array title: Results description: Diagnosis results in request order type: object required: - results title: DiagnosisResponse description: Response containing diagnosis results for all requested domains. HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError DomainCheckRequest: properties: domain: type: string title: Domain description: Domain name to diagnose (e.g., app.example.com) port: type: integer title: Port description: Port number the domain routes to type: object required: - domain - port title: DomainCheckRequest description: Single domain check entry. DomainDiagnosisResult: properties: domain: type: string title: Domain description: Domain name checked port: type: integer title: Port description: Port number checked records: items: $ref: '#/components/schemas/DnsRecordResult' type: array title: Records description: DNS record check results is_valid: type: boolean title: Is Valid description: True if all required records (CNAME, TXT) are correct caa_check: anyOf: - $ref: '#/components/schemas/CaaCheckResult' - type: 'null' description: CAA record check (informational only) type: object required: - domain - port - records - is_valid title: DomainDiagnosisResult description: Diagnosis result for a single domain. ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError DnsRecordResult: properties: record_type: type: string title: Record Type description: 'Record type: CNAME or TXT' query_name: type: string title: Query Name description: Domain name queried expected_value: type: string title: Expected Value description: Expected record value actual_value: anyOf: - type: string - type: 'null' title: Actual Value description: Actual value found, null if missing is_valid: type: boolean title: Is Valid description: True if actual matches expected is_deprecated: type: boolean title: Is Deprecated description: True if this record format is deprecated default: false warning_message: anyOf: - type: string - type: 'null' title: Warning Message description: Deprecation or migration warning type: object required: - record_type - query_name - expected_value - is_valid title: DnsRecordResult description: DNS record check result. CaaCheckResult: properties: caa_records: items: type: string type: array title: Caa Records description: Raw CAA DNS records found accounturi: anyOf: - type: string - type: 'null' title: Accounturi description: Account URI extracted from CAA record acme_fetches: items: $ref: '#/components/schemas/AcmeFetchResult' type: array title: Acme Fetches description: ACME endpoint query attempts expected_uri: anyOf: - type: string - type: 'null' title: Expected Uri description: Expected URI from ACME account is_match: type: boolean title: Is Match description: True if CAA accounturi matches ACME account info_message: anyOf: - type: string - type: 'null' title: Info Message description: Additional context or guidance type: object required: - caa_records - acme_fetches - is_match title: CaaCheckResult description: CAA record check result (informational, not required for validation). AcmeFetchResult: properties: url: type: string title: Url description: ACME endpoint URL queried http_ok: type: boolean title: Http Ok description: True if HTTP 200 response received uri: anyOf: - type: string - type: 'null' title: Uri description: Account URI from response body status_code: anyOf: - type: integer - type: 'null' title: Status Code description: HTTP status code returned error: anyOf: - type: string - type: 'null' title: Error description: Error message if request failed type: object required: - url - http_ok title: AcmeFetchResult description: Result of an ACME account fetch attempt. ````