Home > Uncategorized > ORA-28040: No matching authentication protocol

ORA-28040: No matching authentication protocol

I just install 12C1 database. When the old client 8 connected to the database, it showed the error below.

ORA-28040: No matching authentication protocol

Fixed:

Add the parameter below into $ORACLE_HOME/network/admin/sqlnet.ora. This set SQL

SQLNET.ALLOWED_LOGON_VERSION=8

 

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