VMA:
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The vSphere Management Assistant 6.5 might fail to communicate with vCenter Server. This happens when vCenter Server instance is configured with TLSv1.1 or TLSv1.2 protocols. An error message similar to the following is displayed:
Connect to ServerIP failed with ssl error 0x1.
Workaround: Use an independent vSphere Command Line Interface 6.5. For more information, see the vSphere Command-Line Interface Concepts and Examplesand vSphere Command-Line Interface Reference.
Java SDK:
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For java api to work , set "-Dhttps.protocols=TLSv1,TLSv1.1,TLSv1.2" in program vm arguments.