adop prepare phase failed on master node

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ERROR: The following required ports are in use:
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6802 : Managed Server Port 3
Corrective Action: Free the listed ports and retry the adop operation.
Completed execution : ADOPValidations.java
Solution: 
1. Shutdown all application services on all nodes.
2. Just start admin server (adadminsrvctl.sh start) on master node.
3. run again adop phase=prepare on master node.