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Here are some pre-RCU-run you can perform:
1) Check if you service is up and running.
2) Try to connect to the DB separately using a tool/IDE like SQL Developer, JDeveloper, Toad, etc.
3) Try to run RCU from a different machine. May be there are some Port conflicts.
If you are using Oracle XE
By default Oracle Database Listener' Port is : 1521
Have you tried to set the RCU_JDBC_TRIM_BLOCKS environment variable to TRUE prior running RCU?