05-20-2017
Not a direct answer to your question,
Perhaps after the client upgrade, a ssl/tls protocol version that was previously being used to communicate with the server, became obsolete, so it is forced to use a newer protocol.
- Perhaps the server does not speak the newer protocol, or
- The server certificate is not installed for the newer protocol.
- The client needs to update to a newer root certificate..
Just a few loose thought..
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LEARN ABOUT REDHAT
ssl_get_peer_certificate
SSL_get_peer_certificate(3) OpenSSL SSL_get_peer_certificate(3)
NAME
SSL_get_peer_certificate - get the X509 certificate of the peer
SYNOPSIS
#include <openssl/ssl.h>
X509 *SSL_get_peer_certificate(SSL *ssl);
DESCRIPTION
SSL_get_peer_certificate() returns a pointer to the X509 certificate the peer presented. If the peer did not present a certificate, NULL is
returned.
NOTES
Due to the protocol definition, a TLS/SSL server will always send a certificate, if present. A client will only send a certificate when
explicitly requested to do so by the server (see SSL_CTX_set_verify(3)). If an anonymous cipher is used, no certificates are sent.
That a certificate is returned does not indicate information about the verification state, use SSL_get_verify_result(3) to check the veri-
fication state.
The reference count of the X509 object is incremented by one, so that it will not be destroyed when the session containing the peer cer-
tificate is freed. The X509 object must be explicitly freed using X509_free().
RETURN VALUES
The following return values can occur:
NULL
No certificate was presented by the peer or no connection was established.
Pointer to an X509 certificate
The return value points to the certificate presented by the peer.
SEE ALSO
ssl(3), SSL_get_verify_result(3), SSL_CTX_set_verify(3)
0.9.7a 2001-09-07 SSL_get_peer_certificate(3)