TNS-00584: Valid node checking configuration error

Issue

TNS-00584: Valid node checking configuration error
Issue with listener startup as shown below:
LSNRCTL for Linux: Version 10.2.0.4.0 - Production on 20-AUG-2012 22:28:13

Copyright (c) 1991, 2007, Oracle.  All rights reserved.

Starting /u01/oracle/visdb/10.2.0/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 10.2.0.4.0 - Production
System parameter file is /u01/oracle/visdb/10.2.0/network/admin/VIS_optimebs24/listener.ora
Log messages written to /u01/oracle/visdb/10.2.0/network/admin/vis.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROCVIS)))
Error listening on: (ADDRESS=(PROTOCOL=TCP)(Host=optimebs24.estuate)(Port=1521))
TNS-12560: TNS:protocol adapter error
 TNS-00584: Valid node checking configuration error


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


solution

For this error  edit sqlnet.ora file means comment tcp and invited node validation