Create a new connection using / or just leaving User: and Password: field blank. After connecting, right click on the new connection and disconnect. Then right click again and try to connect.
Notice that error "ORA-01005: null password given; logon denied" is thrown back to you.
TDA(Toad Data Point) is not able to reconnect to Oracle with an existing connection that was created using windows authentication.
Product defect.
WORKAROUND:
You MUST explicitely edit User: field property to leave it blank or just add /.
STATUS:
Issue resolved in Toad Data Point v3.8, available here
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