Fatal NI connect error 12170. 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: 07-FEB-2011 06:31:22 Tracing not turned on. Tns error struct: ns main err code: 12535 TNS-12535: TNS:operation timed out ns secondary err code: 12560 nt main err code: 505 TNS-00505: Operation timed out nt secondary err code: 110 nt OS err code: 0 Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.49.15.145)(PORT=50669))

Fatal NI connect error 12170.

  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: 07-FEB-2011 06:31:22
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12535

TNS-12535: TNS:operation timed out
    ns secondary err code: 12560
    nt main err code: 505

TNS-00505: Operation timed out
    nt secondary err code: 110
    nt OS err code: 0
  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.49.15.145)(PORT=50669))
Mon Feb 07 06:51:20 2011

Solution:-
sqlnet.ora
SQLNET.INBOUND_CONNECT_TIMEOUT= 60
Listener.ora
DIAG_ADR_ENABLED_listener_name=OFF