ORA-28270: Malformed user nickname for password authenticated global user.

Cause : An attempt to login as password-auuthenticated global user with a malformed user nickname.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Make sure the nickname is valid and re-login.

update : 23-07-2017
ORA-28270

ORA-28270 - Malformed user nickname for password authenticated global user.
ORA-28270 - Malformed user nickname for password authenticated global user.

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    Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.