ORA-12705: Invalid or unknown NLS parameter value specified

    You specified an invalid NLS parameter, either in the registry, on the command prompt or shell or using the alter session set NLS.... command.

    Either remove the invalid setting from the registry, unset it in the command prompt/shell or fix the alter session statement.
    eg: 
    C:>set NLS_LANG=american_america.unknown

C:>sqlplus system@ora920

SQL*Plus: Release 9.2.0.7.0 - Production 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

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ERROR:
ORA-12705: invalid or unknown NLS parameter value specified


Enter user-name:

C:>set NLS_LANG=

C:>sqlplus system@ora920

SQL*Plus: Release 9.2.0.7.0 - Production

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

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