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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: 20-DEC-2013 16:54:23
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=192.168.1.211)(PORT=1521))
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说明：这个问题是由于Automatic Diagnostic Repository中的 Oracle Net diagnostic在默认的情况下是开启的，
当数据库和客户端的连接超过特定时间，就会把这样的信息写入到alert日志中，所以这不是一个致命的问题，但大篇幅的显示此错误，
还是屏蔽的好
解决方法：
listener.ora
INBOUND_CONNECT_TIMEOUT_LISTENER = 0
DIAG_ADR_ENABLED_LISTENER = OFF
sqlnet.ora
DIAG_ADR_ENABLED = OFF
SQLNET.INBOUND_CONNECT_TIMEOUT =0