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Explicit usage of MD5withRSA seems suspicious to me. At least looking into my jdk1.8.0_172 java.security file I see MD5 beeing disabled by default, e.g. jdk.tls.disabledAlgorithms=SSLv3, RC4, MD5withRSA ...
Isn't java different on different systems? Running -Djavax.net.debug=all can reveal details.
Changing the algorithm from MD5withRSA to SHA256withRSA seems to have fixed this issue.
https is working on the two IBM machines as far as I can say for now.
More tests have to follow.