2893335 - AS Java TLS handshake failure - unsupported extension

A TLS connection from the AS Java using the IAIK library fails with the following trace, considering that the TLS version is supported by the target server:

Begin IAIK Debug:
ssl_debug(7): Starting handshake (iSaSiLk 5.106)...
ssl_debug(7): Sending v3 client_hello message to <hostname>:<port>, requesting version 3.3...
ssl_debug(7): Sending extensions: renegotiation_info (<XXXXX>), signature_algorithms (<XX>), server_name (<X>)
ssl_debug(7): Received v3 server_hello handshake message.
ssl_debug(7): SSLException while handshaking: Server has sent unrequested extension: unknown (<XX>)
ssl_debug(7): Sending alert: Alert Fatal: unsupported extension
ssl_debug(7): Shutting down SSL layer...
ssl_debug(7): Closing transport...

SAP NetWeaver Application Server Java all versions

sslcontext.properties, SSL config file, ECDHE, ECDSA, cipher suites, cipher suite, handshake failure, elliptic curve algorithms, elliptic curve, elliptic , KBA , BC-JAS-SEC-CPG , Cryptography , Problem