TNSPING hanging

Dear Gurus,
I am finding below report in alert and now i am not able to connect application and Oracle SQL developer tool also :

<msg time='2012-12-05T12:38:10.332+05:30' org_id='oracle' comp_id='rdbms'
 type='UNKNOWN' level='16' host_id='DB1'
 host_addr='xxx.yyy.xx.101'>
 <txt>    nt secondary err code: 0
 </txt>
</msg>
<msg time='2012-12-05T12:38:10.332+05:30' org_id='oracle' comp_id='rdbms'
 type='UNKNOWN' level='16' host_id='DB1'
 host_addr='xxx.yyy.xx.101'>
 <txt>    nt OS err code: 0
 </txt>
</msg>
<msg time='2012-12-05T12:38:10.333+05:30' org_id='oracle' comp_id='rdbms'