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<h1>tls-errors(5)</h1>
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<pre><code><strong>NAME</strong>
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tls-errors - BearSSL TLS and X.509 error codes
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<strong>DESCRIPTION</strong>
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MontaukOS uses BearSSL for TLS 1.2 connections. When a TLS
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operation fails, an integer error code is reported. This page
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lists all possible error codes.
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<strong>SSL/TLS ENGINE ERRORS</strong>
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<strong>0 BR_ERR_OK</strong>
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No error.
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<strong>1 BR_ERR_BAD_PARAM</strong>
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Caller-provided parameter is incorrect.
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<strong>2 BR_ERR_BAD_STATE</strong>
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Operation cannot be applied in the current engine state.
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<strong>3 BR_ERR_UNSUPPORTED_VERSION</strong>
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Incoming protocol or record version is unsupported.
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<strong>4 BR_ERR_BAD_VERSION</strong>
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Incoming record version does not match the expected version.
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<strong>5 BR_ERR_BAD_LENGTH</strong>
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Incoming record length is invalid.
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<strong>6 BR_ERR_TOO_LARGE</strong>
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Incoming record is too large, or buffer is too small for the
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handshake message to send.
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<strong>7 BR_ERR_BAD_MAC</strong>
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Decryption found invalid padding, or the record MAC is
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not correct.
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<strong>8 BR_ERR_NO_RANDOM</strong>
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No initial entropy was provided and none could be obtained
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from the OS.
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<strong>9 BR_ERR_UNKNOWN_TYPE</strong>
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Incoming record type is unknown.
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<strong>10 BR_ERR_UNEXPECTED</strong>
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Incoming record or message has wrong type for the current
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engine state.
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<strong>12 BR_ERR_BAD_CCS</strong>
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ChangeCipherSpec message from the peer has invalid contents.
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<strong>13 BR_ERR_BAD_ALERT</strong>
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Alert message from the peer has invalid contents (odd length).
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<strong>14 BR_ERR_BAD_HANDSHAKE</strong>
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Incoming handshake message decoding failed.
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<strong>15 BR_ERR_OVERSIZED_ID</strong>
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ServerHello contains a session ID larger than 32 bytes.
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<strong>16 BR_ERR_BAD_CIPHER_SUITE</strong>
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Server wants to use a cipher suite that we did not advertise,
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or we tried to advertise a cipher suite that we do not support.
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<strong>17 BR_ERR_BAD_COMPRESSION</strong>
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Server wants to use a compression method that we did not
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advertise.
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<strong>18 BR_ERR_BAD_FRAGLEN</strong>
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Server's max fragment length does not match client's.
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<strong>19 BR_ERR_BAD_SECRENEG</strong>
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Secure renegotiation failed.
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<strong>20 BR_ERR_EXTRA_EXTENSION</strong>
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Server sent an extension type that we did not announce, or
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used the same extension type more than once in ServerHello.
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<strong>21 BR_ERR_BAD_SNI</strong>
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Invalid Server Name Indication contents (when used by the
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server, this extension shall be empty).
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<strong>22 BR_ERR_BAD_HELLO_DONE</strong>
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Invalid ServerHelloDone from the server (length is not 0).
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<strong>23 BR_ERR_LIMIT_EXCEEDED</strong>
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Internal limit exceeded (e.g. server's public key is too
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large).
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<strong>24 BR_ERR_BAD_FINISHED</strong>
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Finished message from peer does not match the expected value.
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<strong>25 BR_ERR_RESUME_MISMATCH</strong>
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Session resumption attempted with a different version or
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cipher suite.
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<strong>26 BR_ERR_INVALID_ALGORITHM</strong>
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Unsupported or invalid algorithm (ECDHE curve, signature
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algorithm, hash function).
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<strong>27 BR_ERR_BAD_SIGNATURE</strong>
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Invalid signature on ServerKeyExchange or CertificateVerify.
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<strong>28 BR_ERR_WRONG_KEY_USAGE</strong>
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Peer's public key does not have the proper type or is not
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allowed for the requested operation.
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<strong>29 BR_ERR_NO_CLIENT_AUTH</strong>
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Client did not send a certificate upon request, or the client
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certificate could not be validated.
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<strong>31 BR_ERR_IO</strong>
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I/O error or premature close on the underlying transport.
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<strong>X.509 CERTIFICATE ERRORS</strong>
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<strong>32 BR_ERR_X509_OK</strong>
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X.509 validation was successful (not an error).
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<strong>33 BR_ERR_X509_INVALID_VALUE</strong>
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Invalid value in an ASN.1 structure.
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<strong>34 BR_ERR_X509_TRUNCATED</strong>
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Truncated certificate.
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<strong>35 BR_ERR_X509_EMPTY_CHAIN</strong>
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Empty certificate chain (no certificate at all).
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<strong>36 BR_ERR_X509_INNER_TRUNC</strong>
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Inner element extends beyond outer element size.
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<strong>37 BR_ERR_X509_BAD_TAG_CLASS</strong>
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Unsupported tag class (application or private).
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<strong>38 BR_ERR_X509_BAD_TAG_VALUE</strong>
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Unsupported tag value.
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<strong>39 BR_ERR_X509_INDEFINITE_LENGTH</strong>
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Indefinite length encoding found.
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<strong>40 BR_ERR_X509_EXTRA_ELEMENT</strong>
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Extraneous element in certificate.
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<strong>41 BR_ERR_X509_UNEXPECTED</strong>
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Unexpected element in certificate.
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<strong>42 BR_ERR_X509_NOT_CONSTRUCTED</strong>
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Expected constructed element, but found primitive.
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<strong>43 BR_ERR_X509_NOT_PRIMITIVE</strong>
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Expected primitive element, but found constructed.
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<strong>44 BR_ERR_X509_PARTIAL_BYTE</strong>
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BIT STRING length is not a multiple of 8.
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<strong>45 BR_ERR_X509_BAD_BOOLEAN</strong>
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BOOLEAN value has invalid length.
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<strong>46 BR_ERR_X509_OVERFLOW</strong>
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Value is off-limits (overflow).
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<strong>47 BR_ERR_X509_BAD_DN</strong>
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Invalid distinguished name.
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<strong>48 BR_ERR_X509_BAD_TIME</strong>
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Invalid date/time representation in certificate.
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<strong>49 BR_ERR_X509_UNSUPPORTED</strong>
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Certificate contains unsupported features that cannot be
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ignored.
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<strong>50 BR_ERR_X509_LIMIT_EXCEEDED</strong>
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Key or signature size exceeds internal limits.
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<strong>51 BR_ERR_X509_WRONG_KEY_TYPE</strong>
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Key type does not match that which was expected.
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<strong>52 BR_ERR_X509_BAD_SIGNATURE</strong>
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Signature is invalid.
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<strong>53 BR_ERR_X509_TIME_UNKNOWN</strong>
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Validation time is unknown (no time was set).
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<strong>54 BR_ERR_X509_EXPIRED</strong>
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Certificate is expired or not yet valid.
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<strong>55 BR_ERR_X509_DN_MISMATCH</strong>
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Issuer/subject DN mismatch in the chain.
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<strong>56 BR_ERR_X509_BAD_SERVER_NAME</strong>
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Expected server name was not found in the chain.
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<strong>57 BR_ERR_X509_CRITICAL_EXTENSION</strong>
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Unknown critical extension in certificate.
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<strong>58 BR_ERR_X509_NOT_CA</strong>
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Not a CA, or path length constraint violation.
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<strong>59 BR_ERR_X509_FORBIDDEN_KEY_USAGE</strong>
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Key Usage extension prohibits the intended usage.
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<strong>60 BR_ERR_X509_WEAK_PUBLIC_KEY</strong>
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Public key found in certificate is too small.
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<strong>62 BR_ERR_X509_NOT_TRUSTED</strong>
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Chain could not be linked to a trust anchor.
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<strong>FATAL ALERTS</strong>
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When a fatal alert is received from the peer, the error code
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is 256 + the TLS alert value. When a fatal alert is sent to
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the peer, the error code is 512 + the TLS alert value.
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Common alert values:
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0 close_notify
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10 unexpected_message
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20 bad_record_mac
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40 handshake_failure
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42 bad_certificate
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43 unsupported_certificate
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44 certificate_revoked
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45 certificate_expired
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46 certificate_unknown
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47 illegal_parameter
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48 unknown_ca
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50 decode_error
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51 decrypt_error
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70 protocol_version
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71 insufficient_security
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80 internal_error
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86 unrecognized_name
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112 no_application_protocol
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For example, error 296 means a handshake_failure alert was
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received (256 + 40 = 296).
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<strong>SEE ALSO</strong>
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fetch(1), syscalls(2)</code></pre>
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