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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]$

 

 

 

Do you want to learn Oracle Database Performance Tuning detailed, then read the following articles.

Performance Tuning and SQL Tuning Tutorial in the Oracle Database

 

 

 

 

Do you want to learn Oracle Database for Beginners, then Click and read the following articles.

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