Tns 00530 protocol adapter error

One of the errors that defeats a lot of new users who install the Oracle Database on the Windows operating system is a two-step event. The first step occurs when you try to connect to the database and it raises the following error:

SQL*Plus: Release 18.0.0.0.0 - Production on Fri Jan 7 21:00:42 2022
Version 18.4.0.0.0
 
Copyright (c) 1982, 2018, Oracle.  All rights reserved.
 
ERROR:
ORA-12541: TNS:no listener

The second step may occur after you get the “no listener” error when you try to start the Oracle listener and it fails to start. The Oracle listener control command is:

When it returns the following error:

LSNRCTL FOR 64-bit Windows: Version 18.0.0.0.0 - Production ON 07-JAN-2022 21:02:20
 
Copyright (c) 1991, 2018, Oracle.  ALL rights reserved.
 
Starting tnslsnr: please wait...
 
Unable TO OpenSCManager: err=5
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error

The problem is generally in two configuration files. They are the listener.ora and tnsnames.ora files. This typically occurs when the developer fails to set the localhost in the Windows operating system hosts configuration file. The chain of events that causes these errors can be avoided when the user puts the following two lines:

127.0.0.1      localhost
::1            localhost

in the following hosts file:

C:Windowssystem32driversetchosts

You can typically avoid these errors when you configure the hosts configuration file correctly before installing the Oracle Database. That’s because the Oracle database installation will use localhost keyword instead of the current, and typically DHCP assigned, IP address.

The loss of connectivity errors typically occur when the IP address changes after the installation. DHCP IP addresses often change as machines disconnect and reconnect to a network.

You can fix a DHCP IP installation of an Oracle database by editing the listener.ora and tnsnames.ora files. You replace the IP addresses with the localhost keyword.

The listener.ora and tnsnames.ora files look like the following for an Oracle Database 21c Express Edition (provided you installed them in a C:appusername directory:

listener.ora

# listener.ora Network Configuration File: C:appusernameproduct21.0.0dbhomeXENETWORKADMINlistener.ora
# Generated by Oracle configuration tools.
 
DEFAULT_SERVICE_LISTENER = XE
 
SID_LIST_LISTENER =
 (SID_LIST =
   (SID_DESC =
     (SID_NAME = CLRExtProc)
     (ORACLE_HOME = C:appusernameproduct21.0.0dbhomeXE)
     (PROGRAM = extproc)
     (ENVS = "EXTPROC_DLLS=ONLY:C:appusernameproduct21.0.0dbhomeXEbinoraclr21.dll")
   )
 )
 
LISTENER =
 (DESCRIPTION_LIST =
   (DESCRIPTION =
     (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
     (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
   )
 )

tnsnames.ora

# tnsnames.ora Network Configuration File: C:appmclaughlinmproduct21.0.0dbhomeXENETWORKADMINtnsnames.ora
# Generated by Oracle configuration tools.
 
XE =
 (DESCRIPTION =
   (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
   (CONNECT_DATA =
     (SERVER = DEDICATED)
     (SERVICE_NAME = XE)
   )
 )
 
LISTENER_XE =
 (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
 
 
ORACLR_CONNECTION_DATA =
 (DESCRIPTION =
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
   )
   (CONNECT_DATA =
     (SID = CLRExtProc)
     (PRESENTATION = RO)
   )
 )

As always, I hope this helps those looking for a solution to something that can take more time than it should to fix.

I am getting the following errors while from the lsnrctl status command:

C:Userspna105>lsnrctl stat

 LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 08-OCT-2014 17:53
 :55

 Copyright (c) 1991, 2010, Oracle.  All rights reserved.

 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
 TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   64-bit Windows Error: 2: No such file or directory
 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
 TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
 TNS-00511: No listener
 64-bit Windows Error: 61: Unknown error

It was working fine before restart but now it is not working and I also can’t access my Oracle homepage.

My tnsnames.ora is:

  ORACLE = 
  (DESCRIPTION =  
    (ADDRESS_LIST =  
      (ADDRESS = (PROTOCOL = TCP)(HOST = Localhost)(PORT = 1521))  
    )  
    (CONNECT_DATA =  
      (SERVICE_NAME = ORACLE)  
    )  
   )

   LISTENER_ORACLE =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


  ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
  )
   (CONNECT_DATA =
   (SID = CLRExtProc)
   (PRESENTATION = RO)
  )
  )

My listener.ora is: (Here were error due to brackets misplaced adding few spaces resolved the problem TNS-12518)

   SID_LIST_LISTENER =
   (SID_LIST =
   (SID_DESC =
    (SID_NAME = ORACLE)
    (ORACLE_HOME = C:appPNA105product11.2.0dbhome_1)
  )  
  (SID_DESC =
    (SID_NAME = PLSExtProc)
    (ORACLE_HOME = C:appPNA105product11.2.0dbhome_1)
    (PROGRAM = extproc)
   )
   (SID_DESC =
  (SID_NAME = CLRExtProc)
  (ORACLE_HOME = C:appPNA105product11.2.0dbhome_1)
  (PROGRAM = extproc)
  (ENVS = "EXTPROC_DLLS=ONLY:C:appPNA105product11.2.0dbhome_1binoraclr11.dll")
  )
  )

  LISTENER =
 (DESCRIPTION_LIST =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
  )
  )

  ADR_BASE_LISTENER = C:appPNA105

Following is the output of lsnrctl start command

C:Userspna105>lsnrctl start

LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 08-OCT-2014 18:26
:22

 Copyright (c) 1991, 2010, Oracle.  All rights reserved.

 Starting tnslsnr: please wait...

  TNS-12560: TNS:protocol adapter error
   TNS-00530: Protocol adapter error

Following is the Last entry needed from log file.

 Started with pid=14784
 Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.pipeEXTPROC1521ipc)))
 Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
 Listener completed notification to CRS on start

 09-OCT-2014 15:46:01 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=INL007306$))
(SERVICE_NAME=oracle)) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=57389)) * 
establish * oracle * 12518
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
 TNS-00530: Protocol adapter error
 64-bit Windows Error: 203: Unknown error
 Dynamic address is already listened on (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp) 
 (HOST=127.0.0.1)(PORT=1521)))
 09-OCT-2014 15:46:06 * service_register * oracle * 0
 Thu Oct 09 15:46:11 2014
 09-OCT-2014 15:46:11 * service_update * oracle * 0
 09-OCT-2014 15:46:12 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=INL007306$))
 (SERVICE_NAME=oracle)) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=57393)) * 
  establish * oracle * 0
 09-OCT-2014 15:46:12 * service_update * oracle * 0
 09-OCT-2014 15:46:13 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=__jdbc__)(USER=INL007306$))
 (SERVICE_NAME=oracle)) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=57394)) * 
 establish * oracle * 0

Tried to resolve TNS-12518 and listener started but still not able to access
Oracle home page

output of lnsrctl stat

C:Userspna105>lsnrctl stat

LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 09-OCT-2014 17:16
:56

 Copyright (c) 1991, 2010, Oracle.  All rights reserved.

 Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
 STATUS of the LISTENER
  ------------------------
 Alias                     LISTENER
 Version                   TNSLSNR for 64-bit Windows: Version 11.2.0.1.0 - Produ
 ction
 Start Date                09-OCT-2014 15:45:58
 Uptime                    0 days 1 hr. 30 min. 58 sec
 Trace Level               off
 Security                  ON: Local OS Authentication
 SNMP                      OFF
 Listener Parameter File   C:appPNA105product11.2.0dbhome_1networkadminli
 stener.ora
 Listener Log File         c:apppna105diagtnslsnrINL007306listeneralertlo
 g.xml
 Listening Endpoints Summary...
 (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.pipeEXTPROC1521ipc)))
 (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
  Services Summary...
  Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
  Service "ORACLE" has 2 instance(s).
  Instance "ORACLE", status UNKNOWN, has 1 handler(s) for this service...
  Instance "oracle", status READY, has 1 handler(s) for this service...
  Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
  Service "oracleXDB" has 1 instance(s).
  Instance "oracle", status READY, has 1 handler(s) for this service...

T he command completed successfully