I've found a few threads where an outdated jdk version on the server/client may be the cause.

Which Flink binary (specifically, for which hadoop version) are you using?

On 03.10.2017 20:48, Hao Sun wrote:
com.amazonaws.http.AmazonHttpClient                           - Unable to 
execute HTTP request: peer not authenticated
javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
        at 
sun.security.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:431)


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