Fatal OR connect 12170 - time-out error

Got some errors in the alert.log to Oracle 11 g 2 file
Fatal NI connect error 12170.

  VERSION INFORMATION:
        TNS for Linux: Version 11.2.0.1.0 - Production
        Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
        TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
  Time: 01-JUL-2010 13:19:32
  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=208.187.32.80)(PORT=1452))
Thu Jul 01 13:19:32 2010
  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=208.187.32.139)(PORT=40530))
  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=208.187.32.89)(PORT=6621))
My questions are:
(1) what is a mistake or a designed behavior that Oracle finds the client been waited too long and kill him.
(2) what is the default time-out value, and how to configure.

Thank you

Hello

Check out the following instructions:

The problem of hanging to continue has been identified in alert_db.log, so the following entries have been put into the system to ensure the connections between free WILL and DB server are alive.

/ etc/sysctl.conf:
NET. IPv4.tcp_keepalive_time = 600
NET. IPv4.tcp_keepalive_intvl = 60
NET. IPv4.tcp_keepalive_probes = 20

Thank you

Tags: Database

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