Problem:
'Cannot connect to database using existing credentials".
This may happen even though you are damn sure you got the username and password correct.
Possible Solution:
Oracle do not accept certain characters such as '.' and ';' and probably many others. So to be safe, use alphanumeric characters.
* During the setting of username and password, Oracle won't complain of illegal characters, but when it comes to logging in, the above error occurs *
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