TNS-12560: TNS:protocol adapter error TNS-00584: Valid node checking configuration error

TNS-12560: TNS:protocol adapter error TNS-00584: Valid node checking configuration error

[oracle@Linux04 ~]$ lsnrctl start

LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 22-MAR-2016 16:00:27

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/Linux04/listener/alert/log.xml
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=newappdb01)(PORT=***)))

TNS-12560: TNS:protocol adapter error
 TNS-00584: Valid node checking configuration error

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


[oracle@newappdb0 ~]$ cd $ORACLE_HOME/network/admin
[oracle@newappdb0 admin]$ vi sqlnet.ora 

[oracle@newappdb0admin]$ cat sqlnet.ora 
# 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)


tcp.validnode_checking = yes
tcp.invited_nodes = (newappdb0)    <<< Here is the problem. I have wrong local hostname in                                                                                    tcp.invited_nodes

Correcting the validnode_checking. I got this issue resolved.