AWS S3 HTTPS connection(TLS handshake) failed several time and success automatically.

Hi,

I am trying to HTTPS connection in the loop until it is connected with the "s3.amazonaws.com" to download one file. I was using the below older CA certificate

Issuer: C = IE, O = Baltimore, OU = CyberTrust, CN = Baltimore CyberTrust Root

and observed that TLS handshake failed with error (-0x2700 Failed to verify peer certificate!) and after several retries, the S3 server TLS handshake pass automatically.

I have observed same thing with the below OpenSSL command

openssl s_client -connect s3.amazonaws.com:443 -CAfile <older s3 server CA cert>

**Verify return code: 20 (unable to get local issuer certificate) ** After several retries Verify return code: 0 (ok)

I would like to know why after several retries S3 server exchanges the older CA certificate during the handshake? and why the retries count is not fixed?

Regards, Arjun