Fatal NI connect error 12170
We are facing below error in our Production Server. We have Oracle 11g installed. Can you please help me to resolve this issue and obliged.
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Fatal NI connect error 12170.
  VERSION INFORMATION:
 TNS for Linux: Version 11.2.0.2.0 - Production
 Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.2.0 - Production
 TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.2.0 - Production
  Time: 04-OCT-2011 15:24:19
  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=xyz)(PORT=2945))