Credentials change for Oracle db hangs (until session timeout) on "applying modified settings" when save changes is executed. (Agent 126.96.36.199)
There is no error or other message/feedback at all. The credentials are verified on the target.
Is an upgrade or patch required?
On the Databases dashboard, select the instance, click Settings, Administration:
Then Connection Details, Set Credentials, update the password, Hit Set (should be step 4), then you can Test the connection (4 in the image), and finally make sure to save changes (button in lower right, #6).
Hope that helps.