问题原因:

Fatal NI connect error 12170.
  VERSION INFORMATION:
     TNS for Linux: Version 11.2.0.3.0 - Production
     Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.3.0 - Production
     TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.3.0 - Production
  Time: 24-MAY-2017 18:40:22
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12535
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: (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.2)(PORT=44430))
WARNING: inbound connection timed out (ORA-3136)
Wed May 24 18:45:22 2017

解决方法:

[oracle@ogg3 ~]$ cd /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/             
[oracle@ogg3 admin]$ vim listener.ora
INBOUND_CONNECT_TIMEOUT_LISTENERNAME = 0

[oracle@ogg3 admin]$ vim sqlnet.ora

DIAG_ADR_ENABLED=OFF
SQLNET.INBOUND_CONNECT_TIMEOUT = 0

[oracle@ogg3 admin]$ lsnrctl
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 28-JUN-2017 18:03:55
Copyright (c) 1991, 2011, Oracle.  All rights reserved.
Welcome to LSNRCTL, type "help" for information.
LSNRCTL> reload

LSNRCTL>exit

[oracle@ogg3 admin]$