Oracle Database Agent installer cannot access Linux Operating System using the challenge response credential (4309833)

The database agent automatically creates two credentials: one uses username/password authentication and the other is using the challenge-response authentication. 

The validation fails due to not being able to select challenge-response credential for authentication for the Infrastructure agent.   

Follow the steps below:

1. Go to "Administration | Agent Status" and find the problematic Oracle-Installer agent
2. Click on "Edit" and then "Edit Properties"
3. Now click on "Modify the private properties for this agent"
4. Change the value for "UNIX Connection Timeout (milliseconds)" from 45000 to 120000