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Three-Phase Registration Disabled

Status Code: 503 Service Unavailable

Problem Description

The requested TPR is currently disabled in the server configuration.

Common Causes

  1. TPR Flag Disabled: The TPR flag for this functionality is turned off
  2. Maintenance Mode: TPR temporarily disabled during maintenance
  3. Deployment Configuration: TPR not enabled in this environment
  4. License Restriction: TPR not available in current license tier

Example Response

{
  "type": "https://arcp.0x001.tech/docs/problems/tpr-disabled",
  "title": "TPR Disabled",
  "status": 503,
  "detail": "Three-phase registration is not enabled",
  "instance": "/auth/agent/validate_compliance",
  "timestamp": "2026-02-02T02:28:37.818Z"
}

Solutions

For Three-Phase Registration

If you're trying to use three-phase registration (/auth/agent/validate_compliance):

  1. Check Configuration: Ensure ARCP_TPR=true in server configuration
  2. Environment Variables: Set the feature flag in .env file: 
    ARCP_TPR=true
  3. Use Legacy Registration: Fall back to standard registration endpoint if three-phase is not required

General Feature Flags

  1. Contact Administrator: Check with server admin about feature availability
  2. Check Documentation: Verify feature requirements and prerequisites
  3. Alternative Approaches: Use alternative endpoints or methods if available

Technical Details

When This Occurs

  • Attempting to use three-phase registration when ARCP_TPR=false
  • Accessing beta/experimental features not enabled in production
  • Using features disabled for security or performance reasons

Server Configuration

Check server logs for: 

TPR flag disabled: ARCP_TPR

Best Practices

  1. Check Feature Availability: Query server capabilities before using advanced features
  2. Graceful Degradation: Implement fallback to standard endpoints
  3. Configuration Management: Maintain consistent TPR flags across environments
  4. Documentation: Document which features require specific configuration