Fatal NI connect error 12537, connecting to: (LOCAL=NO) VERSION INFORMATION: TNS for Linux: Version 11.1.0.7.0 - Production Oracle Bequeath NT Protocol Adapter for Linux: Version 11.1.0.7.0 - Production TCP/IP NT Protocol Adapter for Linux: Version 11.1.0.7.0 - Production

Error:-
i am using oracle AppsR12.1.1 in my database alert log show below error .

Fatal NI connect error 12537, connecting to:
 (LOCAL=NO)

  VERSION INFORMATION:
        TNS for Linux: Version 11.1.0.7.0 - Production
        Oracle Bequeath NT Protocol Adapter for Linux: Version 11.1.0.7.0 - Production
        TCP/IP NT Protocol Adapter for Linux: Version 11.1.0.7.0 - Production
  Time: 05-JAN-2011 12:12:33
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12537

TNS-12535: TNS:operation timed out
    ns secondary err code: 12606
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0
  Client address: <unknown>
ORA-609 : opiodr aborting process unknown ospid (17682_47967265127616)
Wed Jan 05 12:18:13 2011


***********************************************************************

Fatal NI connect error 12537, connecting to:
 (LOCAL=NO)

  VERSION INFORMATION:
        TNS for Linux: Version 11.1.0.7.0 - Production
        Oracle Bequeath NT Protocol Adapter for Linux: Version 11.1.0.7.0 - Production
        TCP/IP NT Protocol Adapter for Linux: Version 11.1.0.7.0 - Production
  Time: 05-JAN-2011 12:18:13
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12537

TNS-12537: TNS:connection closed
    ns secondary err code: 12560
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0
ORA-609 : opiodr aborting process unknown ospid (18182_46915810041024)

Solution:-
shut down your database
edit your db sqlnet.ora
enter below entry DIAG_ADR_ENABLED=off
start your database . then see your problem is resolved