While connecting Oracle 18c using oracle 10g I am getting error like "ORA-28040: No matching authentication protocol exception". I can able to connect "SQL DEVELOPER" but not able to connect "Command prompt"
It is not possible, see Client / Server Interoperability Support Matrix for Different Oracle Versions (Doc ID 207303.1)
Even if you set SQLNET.ALLOWED_LOGON_VERSION_...
the connection will most likely fail with another error.
Oracle documentation says:
Connections to Oracle Database from clients earlier than release 10g fail with the error ORA-28040: No matching authentication protocol.
Starting with Oracle Database 18c, the default value for the
SQLNET.ALLOWED_LOGON_VERSION
parameter changes from 11 in Oracle Database 12c (12.2) to 12 in Oracle Database 18c. The use of this parameter is deprecated.
SQLNET.ALLOWED_LOGON_VERSION
is now replaced with theSQLNET.ALLOWED_LOGON_VERSION_SERVER
andSQLNET.ALLOWED_LOGON_VERSION_CLIENT
parameters. If you have not explicitly set theSQLNET.ALLOWED_LOGON_VERSION_SERVER
parameter in the upgraded database, then connections from clients earlier than release 10g fail with the error ORA-28040: No matching authentication protocol.
See if it helps.
In 18c the default minimum version has been changed from 11 to 12 and SQLNET.ALLOWED_LOGON_VERSION
is deprecated and replaced with SQLNET.ALLOWED_LOGON_VERSION_SERVER
and SQLNET.ALLOWED_LOGON_VERSION_CLIENT
set
SQLNET.ALLOWED_LOGON_VERSION_SERVER=10
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=10
in your sqlnet.ora and reload listener lsnrctl reload
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