SSLhandshakeException when invoking open AWS API?

When I try to invoke my open AWS API (AWS API Manager service), I get a SSLhandshakeException. While if I would use the browser (Atried Chrome and Firefox) to do my GET request, it works fine... 

I'm not using any proxy, or other special SSL/TLS settings, just a vanilla SoapUI 5.2.1 install. 

Also no authentication in my request, it's an open API, but SoapUI seems to refuse the SSL handshake, while my browser doesn't.

I tried to add the AWS server certificate to my cacerts file already, but that doesn't matter. 

It makes no sense to me. Someone have any idea? 

Thanks!

Dennis

Sun Jan 17 13:57:37 CET 2016:ERROR:javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure
   javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure
   	at sun.security.ssl.Alerts.getSSLException(Unknown Source)
   	at sun.security.ssl.Alerts.getSSLException(Unknown Source)
   	at sun.security.ssl.SSLSocketImpl.recvAlert(Unknown Source)
   	at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
   	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
   	at sun.security.ssl.SSLSocketImpl.writeRecord(Unknown Source)
   	at sun.security.ssl.AppOutputStream.write(Unknown Source)
   	at org.apache.http.impl.io.AbstractSessionOutputBuffer.flushBuffer(AbstractSessionOutputBuffer.java:131)