![]() ![]() If the underlying BIO is blocking, SSL_shutdown() will only return once the handshake step has been finished or an error occurred. The behaviour of SSL_shutdown() additionally depends on the underlying BIO. The read direction is closed by the peer. It is not possible to call SSL_write() after calling SSL_shutdown(). SSL_shutdown() only closes the write direction. When the underlying connection shall be used for more communications, the complete shutdown procedure must be performed, so that the peers stay synchronized. ![]() In case the application wants to be able to resume the session, it is recommended to do a complete shutdown procedure (bidirectional close_notify alerts). When a client only writes and never reads from the connection, and the server has sent a session ticket to establish a session, the client might not be able to resume the session because it did not received and process the session ticket from the server. This should only be done when it is known that the other side will not send more data, otherwise there is a risk of a truncation attack. This way resources can be saved, as the process can already terminate or serve another connection. It is acceptable for an application to only send its shutdown alert and then close the underlying connection without waiting for the peer's response. The order of those two steps depends on the application. The shutdown procedure consists of two steps: sending of the close_notify shutdown alert, and reception of the peer's close_notify shutdown alert. if SSL_get_error() has returned SSL_ERROR_SYSCALL or SSL_ERROR_SSL. Note that SSL_shutdown() must not be called if a previous fatal error has occurred on a connection i.e. Whether the operation succeeds or not, the SSL_SENT_SHUTDOWN flag is set and a currently open session is considered closed and good and will be kept in the session cache for further reuse. ![]() SSL_shutdown() tries to send the close_notify shutdown alert to the peer. It sends the close_notify shutdown alert to the peer. SSL_shutdown() shuts down an active TLS/SSL connection. _owur int SSL_shutdown_ex(SSL *ssl, uint64_t flags, Thanks.SSL_shutdown, SSL_shutdown_ex - shut down a TLS/SSL or QUIC connection SYNOPSIS #include Please let me know if you can help or if more info would be helpful. These errors are sporadic but frequent enough where they are giving us some real problems with our application. ![]() However, we are often able to successfully make a call to this endpoint. The endpoint we are seeing the error with is most often: So it seems like some type of handshake problem. In the rest of the trace, we normally see a “Change Cipher Spec, Encrypted Handshake Message” packet following that. This packet is right after a “Client Key Exchange, Change Cipher Spec, Encrypted Handshake Message” packet. We did some monitoring with Wireshark and found the following TLSv1.2 packet info:Īlert (Level: Fatal, Description: Bad Record MAC) The request was aborted: Could not create SSL/TLS secure channel. Intermittently (but frequently) we are getting connection errors. The application can connect and normally makes some successful calls, downloading first a list of users and then recordings and meeting details. NET client running in Windows Server 2012 R2. We are having some SSL/TLS errors on production servers with our application that uses the Zoom API. ![]()
0 Comments
Leave a Reply. |