Here’s a more comprehensive and organized list of common error code prefixes used in ASP.NET Core and related libraries, particularly in areas like authentication, authorization, and identity management:

1. IDX (Identity Model Errors)

• Purpose: Relates to identity, token validation, and cryptographic operations, particularly in the Microsoft IdentityModel libraries used for handling JWTs, OAuth, OpenID Connect, etc.
• Examples:
  • IDX102: Errors related to token validation.
    • IDX10223: Signature validation failed.
  • IDX105: Errors related to token processing.
    • IDX10501: Token has expired.
    • IDX10503: Signature validation failed due to an invalid key.
  • IDX106: Errors related to token lifetime validation.
    • IDX10634: Token has an invalid lifetime.
  • IDX208: Errors related to metadata retrieval.
    • IDX20803: Unable to retrieve metadata.

2. CORS (Cross-Origin Resource Sharing Errors)

• Purpose: Deals with cross-origin requests and related security policies.
• Examples:
  • CORS: General errors related to CORS policy enforcement.
    • CORS1000: CORS policy error, such as disallowed origin or method.

3. AUTH (Authentication Errors)

• Purpose: Generic authentication errors, often tied to the ASP.NET Core Authentication middleware.
• Examples:
  • AUTH0001: Failed to authenticate the user due to missing credentials.
  • AUTH1001: Unauthorized access attempt detected.

4. SEC (Security Errors)

• Purpose: Broad category for security-related errors, including encryption, decryption, and secure data handling.
• Examples:
  • SEC0001: Encryption operation failed.
  • SEC1001: Decryption key is invalid or missing.

5. SAML (Security Assertion Markup Language Errors)

• Purpose: Errors related to SAML authentication, commonly used in Single Sign-On (SSO) scenarios.
• Examples:
  • SAML1001: SAML assertion is invalid or malformed.
  • SAML2002: SAML response signature is invalid.

6. OPENID (OpenID Connect Errors)

• Purpose: Errors related to the OpenID Connect protocol, often involving identity providers (IdPs).
• Examples:
  • OPENID2001: Failed to retrieve OpenID Connect metadata.
  • OPENID3001: Invalid OpenID Connect token received.

7. JWT (JSON Web Token Errors)

• Purpose: Specifically deals with JWT processing and validation.
• Examples:
  • JWT1001: JWT is malformed or contains invalid claims.
  • JWT2001: JWT signature validation failed.

8. HTTP (HTTP Protocol Errors)

• Purpose: General HTTP protocol-related errors, often seen in web API contexts.
• Examples:
  • HTTP400: Bad request error, indicating the request could not be understood or was missing required parameters.
  • HTTP401: Unauthorized error, indicating authentication is required but missing or failed.

9. ENT (Entity Framework or Data Layer Errors)

• Purpose: Errors related to data access, particularly when using Entity Framework or similar ORM tools.
• Examples:
  • ENT1001: Database connection failed.
  • ENT2001: Entity not found or query returned no results.

10. CONFIG (Configuration Errors)

• Purpose: Errors related to application configuration, including app settings, connection strings, etc.
• Examples:
  • CONFIG001: Missing required configuration section.
  • CONFIG1001: Invalid configuration value detected.

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