knowledge/content/docs/technologies/tls.adoc

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== TLS

=== Alert codes

[options="header",cols=">s,<10"]
|===============================================================================
| Code | Meaning
| 0 | Close notify
| 10 | Unexpected message
| 20 | Bad record MAC
| 21 | Decryption failed
| 22 | Record overflow
| 30 | Decompression failed
| 40 | Handshake failed
| 41 | No certificate (SSL 3.0)
| 42 | Certificate is bad
| 43 | Certificate is not supported
| 44 | Certificate was revoked
| 45 | Certificate is expired
| 46 | Unknown certificate
| 47 | Illegal parameter
| 48 | CA is unknown
| 49 | Access was denied
| 50 | Decode error
| 51 | Decrypt error
| 60 | Export restriction
| 70 | Error in protocol version
| 71 | Insufficient security
| 80 | Internal error
| 86 | Inappropriate fallback
| 90 | User canceled
| 100 | No renegotiation is allowed
| 109 | An extension was expected but was not seen
| 110 | An unsupported extension was sent
| 111 | Could not retrieve the specified certificate
| 112 | The server name sent was not recognized
| 115 | The SRP/PSK username is missing or not known
| 116 | Certificate is required
| 120 | No supported application protocol could be negotiated
|===============================================================================

Source: https://www.gnutls.org/manual/html_node/The-TLS-Alert-Protocol.html