Ssl error internal_error alert

ssl error internal_error alert

{ssl_upgrade_error,{tls_alert,"internal error”}} Alert 80 and the above suggest it is a TLS implementation issue. Please ask on erlang-users. TLS alert, internal error (592): * error:14004438:SSL routines:CONNECT_CR_SRVR_HELLO:tlsv1 alert internal error * Closing connection 0. Closing connection 0 curl: (35) error:14004438:SSL routines:CONNECT_CR_SRVR_HELLO:tlsv1 alert internal error. If it is of any use. ssl error internal_error alert

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error:14004438:SSL routines:CONNECT_CR_SRVR_HELLO:tlsv1 alert internal error

I have tried searching for this, and I have found things that are close, but I have not found anything that helps so far. I apologize in advance if this is already asked.

I have a service which is behind an HTTP VIP, and that is working fine. Now I am trying to add a TCP VIP and do TLS termination on the host, but when I run cURL to test read_big medium error asc=0x11 it is working (please let ssl error internal_error alert know if there is a better way to test the connection), I get the following error, but I do not know what it means. From what I have read from this link, I think it is something to do with the certificate step not working, but I do not know how to figure out why it is not working.

Does anyone know what I am doing wrong or how to go about troubleshooting this? If I need to provide any additional information, please let me know. I am not very experienced with networking, so a lot of this is new to me.

If it is of any use, I am using the following version of cURL.


After running openssl s_client, I get the following output:

I am still not that familiar with networking. Does this mean there is something wrong with the certificate or pem file or key file or what else does this mean? I am sorry if this is a dumb question. I have just never really done much networking work error opening cd dvd plugin 2

Here is the command using -msg.

Thank you so much for your help.

The alert protocol is there to allow signals to be sent between peers. These signals are mostly used to inform the peer about the cause of a protocol failure. Some of these signals are used internally by the protocol and the application protocol does not have to cope with them (e.g. ), and others refer to the application protocol solely (e.g. ). An alert signal includes a level indication which may be either fatal or warning (under TLS1.3 all alerts are fatal). Fatal alerts always terminate the current connection, and prevent future re-negotiations using the current session ID. All supported alert messages are summarized in the table below.

The alert messages are protected by the record protocol, thus the information that is included does not leak. You must take extreme care for the alert information not to leak to a possible attacker, via public log files etc.

AlertIDDescriptionGNUTLS_A_CLOSE_NOTIFY0Close notifyGNUTLS_A_UNEXPECTED_MESSAGE10Unexpected messageGNUTLS_A_BAD_RECORD_MAC20Bad record MACGNUTLS_A_DECRYPTION_FAILED21Decryption failedGNUTLS_A_RECORD_OVERFLOW22Record overflowGNUTLS_A_DECOMPRESSION_FAILURE30Decompression failedGNUTLS_A_HANDSHAKE_FAILURE40Handshake failedGNUTLS_A_SSL3_NO_CERTIFICATE41No certificate (SSL 3.0)GNUTLS_A_BAD_CERTIFICATE42Certificate is badGNUTLS_A_UNSUPPORTED_CERTIFICATE43Certificate is not supportedGNUTLS_A_CERTIFICATE_REVOKED44Certificate was revokedGNUTLS_A_CERTIFICATE_EXPIRED45Certificate is expiredGNUTLS_A_CERTIFICATE_UNKNOWN46Unknown certificateGNUTLS_A_ILLEGAL_PARAMETER47Illegal parameterGNUTLS_A_UNKNOWN_CA48CA is unknownGNUTLS_A_ACCESS_DENIED49Access was deniedGNUTLS_A_DECODE_ERROR50Decode errorGNUTLS_A_DECRYPT_ERROR51Decrypt errorGNUTLS_A_EXPORT_RESTRICTION60Export restrictionGNUTLS_A_PROTOCOL_VERSION70Error in protocol versionGNUTLS_A_INSUFFICIENT_SECURITY71Insufficient securityGNUTLS_A_INTERNAL_ERROR80Internal errorGNUTLS_A_INAPPROPRIATE_FALLBACK86Inappropriate fallbackGNUTLS_A_USER_CANCELED90User canceledGNUTLS_A_NO_RENEGOTIATION100No renegotiation is allowedGNUTLS_A_MISSING_EXTENSION109An extension was expected but was not seenGNUTLS_A_UNSUPPORTED_EXTENSION110An unsupported extension was sentGNUTLS_A_CERTIFICATE_UNOBTAINABLE111Could not retrieve the specified certificateGNUTLS_A_UNRECOGNIZED_NAME112The server name sent was not recognizedGNUTLS_A_UNKNOWN_PSK_IDENTITY115The SRP/PSK username is missing or not knownGNUTLS_A_CERTIFICATE_REQUIRED116Certificate is requiredGNUTLS_A_NO_APPLICATION_PROTOCOL120No supported application protocol could be negotiated

SSL/TLS Alert Protocol and the Alert Codes

During SSL/TLS handshake failures, you may notice a SChannel event being logged in the System event logs. A closer looks provides that there is a number associated with these failure messages, ssl error internal_error alert. The logging mechanism is a part of the SSL/TLS Alert Protocol. These alerts are used to notify peers of the normal and error conditions. The numbers especially, play a trivial role in understanding the problem/failure within the SSL/TLS handshake.SChannel logging may have to be enabled on the windows machines to get detailed SChannel messages. Please refer the following article to do so:

Below is an example of one such event:

Log Name:      System

Source:        Schannel

Date:          x/xx/xxxx x:xx:xx

Event ID:      36887

Task Category: None

Level:         Error


User:          SYSTEM

Computer:      xxxxxxx

Description: The following fatal alert was received: 47.

These warnings sometimes are very helpful in troubleshooting SSL related issues and provide important clues. However, there is not much documentation available on the description of the alert codes.These alert codes have been ssl error internal_error alert precisely in TLS/SSL RFC’s for all the existing protocol versions.

The RFC has a definition for the various alert messages encountered during SSL/TLS handshake.Below is a snippet from the above RFC describing the various alert messages:



There is MSDN article which describes these messages more briefly. Here is the link:, the article never mentions the alert codes while explaining the messages. For simplicity, Fatal error error while parsing xml have created a simpler table combining both the MSDN documentation and the RFC for usability. Below is the table:

Alert Code

Alert Message




Notifies the recipient that the sender will not send any more messages on this connection.



Received an inappropriate message This alert should never be observed in communication between proper implementations. This message is always fatal.



Received a record with an incorrect MAC. This message is always fatal.



Decryption of a TLSCiphertext record is decrypted in an invalid way: either it was not an even multiple of the block length or its padding values, when checked, were not correct. This message is always fatal.



Received a TLSCiphertext record which had a length more than 2^14+2048 bytes, or a ssl error internal_error alert decrypted to a TLSCompressed record with more than 2^14+1024 bytes. This message is always fatal.



Received improper input, such as data that would expand noise extrem terror excessive length, from the decompression function. This message is always fatal.



Indicates that the sender was unable to negotiate an acceptable set of security parameters given the options available. This is a fatal error.



There is a problem with the certificate, ssl error internal_error alert, for example, a certificate is corrupt, or a certificate contains signatures that cannot be verified.



Received an unsupported certificate type.



Received a certificate that was revoked by its signer.



Received a certificate has expired or is not currently valid.



An unspecified issue took place while processing the certificate that made it unacceptable.



Violated security parameters, such as a field in the handshake was out of range or inconsistent with other fields. This is always fatal.



Received a valid certificate chain or partial chain, but the certificate was not accepted because the CA certificate could not be located or could not be matched with a known, trusted CA. This message is always fatal.



Received a valid certificate, but when access control was applied, the sender did not proceed with negotiation. This message is always fatal.



A message could not be decoded because some field was out of the specified range or the length of the message was incorrect. This message is always fatal.



Failed handshake cryptographic operation, including being unable to correctly verify a signature, decrypt a key exchange, or validate a finished message.



Detected a negotiation that was not in compliance with ssl error internal_error alert restrictions; for example, attempting to transfer a 1024 bit ephemeral RSA key for the RSA_EXPORT handshake method. This message is always fatal.



The protocol version the client attempted to negotiate is recognized, but not supported. For example, old protocol versions might be avoided for security reasons. This message is always fatal.



Failed negotiation specifically because the server requires ciphers more secure than those supported by the client. Ssl error internal_error alert instead of handshake_failure. This message is always fatal.



An internal error unrelated to the peer or the correctness of the protocol makes it impossible to continue, such as a memory allocation failure. The error is not related to protocol, ssl error internal_error alert. This message is always fatal.



Cancelled handshake for a reason that is unrelated to a protocol failure. If the user cancels an operation after the handshake is complete, just closing the connection by sending a close_notify is more appropriate. This alert should be followed by a close_notify. This message is generally a warning.



Sent by the client in response to a hello request or sent by the server in response to a client hello after initial handshaking. Either of these would normally lead to renegotiation; when that is not appropriate, the recipient should respond with this alert; at that point, the original requester can decide whether to proceed with the connection. One case where this would be appropriate would be where a server has spawned a process to satisfy a request; the process might receive security parameters (key length, authentication, and so on) at start-up and it might be difficult to communicate changes to these parameters after that point. This message is always a warning.




There were few articles that I found while searching that contain additional alert codes. However, ssl error internal_error alert, I don’t find these to be part of the RFC. Here is one: includes additional alerts like 110, 111, 112, ssl error internal_error alert, 113, 114, 115. You can browse the above link for further reading.Hope someone finds the above table useful. It may not help you in solving any issue but would provide useful pointers. 

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