TNS-12538: TNS:no such protocol adapter


Sometimes You can get “TNS-12538: TNS:no such protocol adapter ” error.


Details of error are as follows.

TNS-12538: TNS:no such protocol adapter
Cause: The protocol adapter requested (by way of the “(PROTOCOL=..)” keyword-value pair in a TNS address) is
unknown. If the supplied address is typographically correct then the protocol adapter is not installed.
Action: Install the protocol adapter or correct typographically error, as appropriate. Note: if the supplied
address was derived from resolving the service name, check the address in the appropriate file (TNSNAMES.ORA, LISTENER.ORA or SQLNET.ORA).
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=msdbadm01)(PORT=1521)))
TNS-12538: TNS:no such protocol adapter
TNS-12560: TNS:protocol adapter error
TNS-00508: No such protocol adapter..



To solve this error, run the relink all as follows.

$ORACLE_HOME/bin relink all


Then try to start again. It will work fine.


Sometimes you may run the lsnrctl status command with different OS user instead of Oracle, in this time you can get this error.




Do you want to learn more details about RMAN, then read the following articles.


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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