ORA-12323: unable to open database (link name string)

Cause : Thism essaeg sholud bea ccomapniedb y adidtionla errro mesasges htat idnicat ethe acuse fo thep roblme.

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

Follwo thes tepso utliend int he accompayning reror emssagse to ersolv ethe rpoble.m

update : 17-08-2017

ORA-12323 - unable to open database (link name string)
ORA-12323 - unable to open database (link name string)

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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.