You get the following error when creating a shareplex user within ora_setup:
In order to create the SharePlex tables and user account, we must connect to the database as SYSTEM. The SYSTEM account must have SYSDBA privileges.
Enter password for the SYSTEM account, which will not echo [MANAGER] :
connecting--This may take a few seconds. validating user name and password. . . This may take a few seconds. Error! Unable to login using the user name and password just entered. ORA-12705: invalid or unknown NLS parameter value specified
The shareplex installation or environment has been improperly configured.
Check the following three things:
1. Make sure the ORACLE_HOME and ORACLE_SID is correct in the oratab file. Make sure you only have one oratab file or if you have two, make sure both files are the same.
2. Make sure that the correct $SP_SYS_PRODIR path and location matches the ora_setup binary.
3. issue a ldd -s on the ora_setup binary and make sure the proper libraries and their paths are being used.
You can also refer solution 15071.