Trying latest aws iot sdk for C demos, can’t establish a TLC connection

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I have to update my mqtt client application with latest version of aws iot sdk, I tried a demo fouded in the sdk directory (mqtt_demo_basic_tls) i can built it and when executed It shown an error message:
[ERROR] [Transport_OpenSSL_Sockets] [openssl_posix.c:280] SSL_connect failed to perform TLS handshake.
[ERROR] [Transport_OpenSSL_Sockets] [openssl_posix.c:696] Failed to establish a TLS connection.
I’m using broker path a3avgzpu0t174x-ats.iot.eu-central-1.amazonaws.com and default CACERT AmazonRootCA1.crt.
what am I doing wrong?

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