3495856 - Test connection fails in adapter datastore with error:" adapterException: Unable to connect to XXX Error : IOException in connect Error : proxyjava.net.UnknownHostException: proxy" - SAP Cloud Integration for data services

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• Adapter datastore test connection fails.
• Error: Unable to connect to <URL> Error : IOException in connect Error : proxyjava.net.UnknownHostException: proxy
• Error in adapter log: 
  Thread[Thread-10,5,main]     Cannot start session. com.acta.adapter.sdk.AdapterException: Unable to connect to <URL> Error : Unable to connect to <URL> Error : IOException in connect Error : proxyjava.net.UnknownHostException: proxy
      at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:196)
      at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
      at java.net.Socket.connect(Socket.java:874)
      at java.net.Socket.connect(Socket.java:811)

• SAP Cloud Integration for data services
• Adapter datastore

KBA , LOD-HCI-DS , HANA Cloud Integration for Data Services , LOD-HCI-DS-AGNT , On-Premise Agent, Connectivity, Task Run errors , Problem