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I will need bit more details about this issue.
- Have you setup your connection using the direct port of WebCenter Portal or the OHS port?
- Have you configured it using a user with Administrative privileges in your WebCenter Portal Environment?
- Can you share the Message Log of JDeveloper?.
Also share screenshot if it helps.
this issue is resolved. cannot expand connection is known issue on Oracle support and simply applying oracle recommended patch to the portal server resolves. no other changes. no changes on jdev front.