The Network Adapter could not establish the connection

Hi,

I got ” The Network Adapter could not establish the connection” error in SQL Developer, TOAD and PL/SQL Developer connection for Oracle database.

 

 

The Network Adapter could not establish the connection

 

Details of error are as follows.

java.sql.SQLException: Io exception: The Network Adapter could not establish the connection.

 

 

The Network Adapter could not establish the connection error is related with the wrong URL or IP Adress, Service_Name, SID and Port number.

If you got The Network Adapter could not establish the connection error, then check your URL, IP Adress, Port,Service_Name, SID and DNS, If any of them is wrong, then fix it.

If your URL, IP Adress, Port, Service_Name or SID are correct, then check your database listener if it is configured properly or not.

 

 

lsnrctl status | lsnrctl stop | lsnrctl start

To solve The Network Adapter could not establish the connection error, type your URL, IP Adress, Port,Service_Name, SID or reload and stop, start your database’s listener as follows.

 

[[email protected] ~]$ lsnrctl status

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 17-SEP-2020 15:54:45

Copyright (c) 1991, 2014, Oracle. All rights reserved.

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date 23-JUL-2020 01:45:30
Uptime 56 days 14 hr. 9 min. 15 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/12.1.0.2/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/MSDBdbadm01/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.3.16)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.2.9)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "-MGMTDBXDB" has 1 instance(s).
Instance "-MGMTDB", status READY, has 1 handler(s) for this service...
Service "MSDB" has 1 instance(s).
Instance "MSDB1", status READY, has 1 handler(s) for this service...
Service "MSDBXDB" has 1 instance(s).
Instance "MSDB1", status READY, has 1 handler(s) for this service...
Service "_mgmtdb" has 1 instance(s).
Instance "-MGMTDB", status READY, has 1 handler(s) for this service...
Service "cluster_clu1" has 1 instance(s).
Instance "-MGMTDB", status READY, has 1 handler(s) for this service...
The command completed successfully
[[email protected] ~]$




[[email protected] ~]$ lsnrctl stop

[[email protected] ~]$ lsrnctl start

 

You should use IP, Port, Service_name as above.

 

Do you want to learn Oracle SQL, then read the following articles.

Oracle SQL Tutorials For Beginners – Learn Oracle SQL from scratch with Oracle SQL Online Course

 

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About Mehmet Salih Deveci

I am Founder of SysDBASoft IT and IT Tutorial and Certified Expert about Oracle & SQL Server database, Goldengate, Exadata Machine, Oracle Database Appliance administrator with 10+years experience.I have OCA, OCP, OCE RAC Expert Certificates I have worked 100+ Banking, Insurance, Finance, Telco and etc. clients as a Consultant, Insource or Outsource.I have done 200+ Operations in this clients such as Exadata Installation & PoC & Migration & Upgrade, Oracle & SQL Server Database Upgrade, Oracle RAC Installation, SQL Server AlwaysOn Installation, Database Migration, Disaster Recovery, Backup Restore, Performance Tuning, Periodic Healthchecks.I have done 2000+ Table replication with Goldengate or SQL Server Replication tool for DWH Databases in many clients.If you need Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS Consultancy and Training you can send my email adress [email protected].-                                                                                                                                                                                                                                                 -Oracle DBA, SQL Server DBA, APPS DBA,  Exadata, Goldengate, EBS ve linux Danışmanlık ve Eğitim için  [email protected] a mail atabilirsiniz.

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