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STATUS_CRYPTO_SYSTEM_INVALID
Separate an unavailable crypto primitive from a KDC policy mismatch
STATUS_CRYPTO_SYSTEM_INVALID indicates that a required cryptographic or checksum function is not available to the security package. Kerberos defines encryption and checksum profiles through registered algorithm types, and RFC 3961 describes the framework used by Kerberos cryptosystems. Windows KILE documents the encryption and checksum behavior implemented by the Windows Kerberos package.
This is not the same as STATUS_KDC_UNKNOWN_ETYPE, where the KDC cannot satisfy a requested encryption type, or STATUS_STRONG_CRYPTO_NOT_SUPPORTED, where negotiation requires stronger cryptography than the local system supports. Here the local processing path is missing a function it needs for the selected crypto/checksum system.
Record the requested and selected encryption and checksum identifiers, security package, Windows version, and recent hardening or provider changes. Do not broadly re-enable RC4 or other legacy types merely because the failure is cryptographic. First determine whether the configuration selected an unsupported algorithm, a security provider failed to load, or an implementation path is absent on that system.
What to inspect
- Kerberos encryption type and checksum type identifiers from the failing exchange, plus the stage at which processing failed.
- Allowed-encryption policy, account/service capabilities, and OS versions on the client, KDC, and target service.
- Recent security-provider, crypto-policy, or system-file changes that could remove an implementation required by the selected type.
References
- RFC 3961: Encryption and checksum specifications for Kerberos
- RFC 4120: Kerberos V5
- Microsoft Open Specifications: Kerberos Protocol Extensions
- Microsoft: Kerberos authentication overview
- Microsoft Open Specifications: NTSTATUS values
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