ORA-28040: No matching authentication protocol

You can get ” ORA-28040: No matching authentication protocol ” error because of Oracle Client incompatibility when you upgrade Oracle database from 11g to 12c or Oracle 18c, 19c,

 

 

ORA-28040: No matching authentication protocol 19c

 

If you get  ORA-28040 error When you connect to Oracle 19c database then change your sqlnet.ora file like below. Add these two lines to the sqlnet.ora

 

SQLNET.ALLOWED_LOGON_VERSION_SERVER=8
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=8

 

[oracle@MehmetSalih ~]$ ps -ef | grep smon
oracle 25167 17807 0 11:56 pts/0 00:00:00 grep --color=auto smon
oracle 28385 1 0 10:31 ? 00:00:00 ora_smon_DEVECI19C
[oracle@MehmetSalih ~]$
[oracle@MehmetSalih ~]$
[oracle@MehmetSalih ~]$ cd $ORACLE_HOME
[oracle@MehmetSalih install]$ cd network/admin/
[oracle@MehmetSalih admin]$


[oracle@MehmetSalih admin]$ cat sqlnet.ora
# sqlnet.ora Network Configuration File: /oradata/install/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)


SQLNET.ALLOWED_LOGON_VERSION_SERVER=8
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=8

 

SQLNET.ORA

If you change sqlnet.ora file which is under the $ORACLE_HOME/network/admin then reload your listener like below. And try to connect again.

[oracle@MehmetSalih admin]$ lsnrctl reload

LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 01-MAR-2019 11:57:26

Copyright (c) 1991, 2018, Oracle. All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
The command completed successfully
[oracle@MehmetSalih admin]$
[oracle@MehmetSalih admin]$
[oracle@MehmetSalih admin]$ lsnrctl status

LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 01-MAR-2019 11:57:30

Copyright (c) 1991, 2018, Oracle. All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 01-MAR-2019 11:46:57
Uptime 0 days 0 hr. 10 min. 32 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Log File /u01/app/oracle/diag/tnslsnr/MehmetSalih/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=MehmetSalih.DeveciDomain)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=MehmetSalih.DeveciDomain)(PORT=5500))(Security=(my_wallet_directory=/u01/app/oracle/admin/DEVECI19C/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "DEVECI19C.DeveciDomain" has 1 instance(s).
Instance "DEVECI19C", status READY, has 1 handler(s) for this service...
Service "DEVECI19CXDB.DeveciDomain" has 1 instance(s).
Instance "DEVECI19C", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@MehmetSalih admin]$

 

 

 

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Performance Tuning and SQL Tuning Tutorial in the Oracle Database

 

 

 

 

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