TNS-00583: Valid node checking: unable to parse configuration parameters

 TNS-12560: TNS:protocol adapter error  TNS-00583: Valid node checking: unable to parse configuration parameters

I  Received following errors when trying to startup my listener. I verified the listener.ora and sqlnet.ora files and everything seemed to look normal.
 
[oracle@Linux03 encryption_keystore]$ lsnrctl start

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 12-JUL-2016 10:05:32

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

Starting /u01/app/oracle/product/12.1.0.2/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 12.1.0.2.0 - Production
System parameter file is /u01/app/oracle/product/12.1.0.2/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/Linux03/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=Linux03)(PORT=1521)))
TNS-12560: TNS:protocol adapter error
 TNS-00583: Valid node checking: unable to parse configuration parameters


Listener failed to start. See the error message(s) above...

[oracle@Linux03 encryption_keystore]$ lsnrctl start

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 12-JUL-2016 10:07:41

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

Starting /u01/app/oracle/product/12.1.0.2/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 12.1.0.2.0 - Production
System parameter file is /u01/app/oracle/product/12.1.0.2/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/Linux03/listener/alert/log.xml
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=Linux03)(PORT=1521)))
TNS-12560: TNS:protocol adapter error
 TNS-00583: Valid node checking: unable to parse configuration parameters


Listener failed to start. See the error message(s) above...


I had below line in my sqlnet.ora file.

[oracle@Linux03 admin]$ cat sqlnet.ora_bak
# sqlnet.ora Network Configuration File: /u01/app/oracle/product/12.1.0.2/db_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

ENCRYPTION_WALLET_LOCATION =
  (SOURCE =(METHOD = FILE)(METHOD_DATA =
    (DIRECTORY = /u01/app/oracle/admin/$ORACLE_SID/encryption_keystore/)     

Solution (In my case):

1. Tried to remove the ENCRYPTION_WALLET_LOCATION info and it worked for me. I knew there was somthing wrong with the syntax.
2. Copied the content from ENCRYPTION_WALLET* into notepad ++ . It helped me realize that I was missing two closing parenthesis )) at end.
3. Added them at end. Started the listener and worked.


[oracle@Linux03 encryption_keystore]$ lsnrctl start

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 12-JUL-2016 10:31:41

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

Starting /u01/app/oracle/product/12.1.0.2/db_1/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 12.1.0.2.0 - Production
System parameter file is /u01/app/oracle/product/12.1.0.2/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/Linux03/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Linux03)(PORT=1521)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=Linux03)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date                12-JUL-2016 10:31:41
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/12.1.0.2/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/Linux03/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Linux03)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
The listener supports no services
The command completed successfully


Also try these if above trick doesn't help.

1.  Oracle listener.ora or sqlnet.ora file contains any special characters.
2.  Oracle Listener.ora or sqlnet.ora file are in wrong format or syntax.
3.  Oracle listener.ora or sqlnet.ora file have some left justified parenthesis which are not accepted by oracle parser.