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

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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...

sol -for this error  edit sqlnet.ora file means comment tcp and invited node validation.