Oracle, Plsql, Sql

ORA 28040 no machine authentication protocol Error.

I am trying to connect with Plsql Developer to Oracle databse Oracle 12c in Oracle Linux 7.3 system. However, whenever i run my application i get following exception. Error messages summary : “connect error, ORA-28040: No matching authentication protocol”

Bug number -> 14575666

Screen Shot 2017-07-13 at 20.14.27

Solutions 1 : 

1. Connect to system with oracle user
2. set SQLNET.ALLOWED_LOGON_VERSION=8 in the sqlnet.ora file.

Solutions 2 :

Plsql developer may have stayed on the old version. Update the Plsql Developer 
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ORA 28040 no machine authentication protocol Error.

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