客户端连接oracle无服务器提示ORA-12537：TNS:连接关闭

今天有个朋友出现了这么一个情况，在使用pl/sql连接数据库的时候提示ORA-12537：TNS:连接关闭。

查看过程(为了保密，特模拟过程)：

查看过程：

1)查看客户端tnsname.ora文件信息如下：

# tnsnames.ora Network Configuration File: E:\softsetup\oracle_client\oracle_base\network\admin\tnsnames.ora

# Generated by Oracle configuration tools.

RHYS =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.101)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = RHYS)

)

)

没有问题

2)查看服务器监听状态

[oracle@oracle-one ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 01-NOV-2013 11:19:35

Copyright (c) 1991, 2013, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle-one)(PORT=1521)))

STATUS of the LISTENER

------------------------

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production

Start Date                01-NOV-2013 11:08:41

Uptime                    0 days 0 hr. 10 min. 54 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   /opt/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora

Listener Log File         /opt/app/oracle/diag/tnslsnr/oracle-one/listener/alert/log.xml

Listening Endpoints Summary...

(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle-one)(PORT=1521)))

(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))

Services Summary...

Service "RHYS" has 1 instance(s).

Instance "RHYS", status READY, has 1 handler(s) for this service...

Service "RHYSXDB" has 1 instance(s).

Instance "RHYS", status READY, has 1 handler(s) for this service...

The command completed successfully

[oracle@oracle-one ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Nov 1 11:19:38 2013

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> show parameter service

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

service_names                        string      RHYS

SQL>

正常

3)在客户端使用tnsping：

C:\Users\Administrator>tnsping rhys

TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 01-11月-

2013 11:10:05

Copyright (c) 1997, 2010, Oracle.  All rights reserved.

已使用的参数文件:

E:\softsetup\oracle_client\oracle_base\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名

尝试连接 (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.1

68.56.101)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RHYS)))

TNS-12547: TNS: 丢失连接

C:\Users\Administrator>

4)在服务器查看sqlnet.ora文件内容如下：

tcp.validnode_checking=yes

tcp.invited_nodes=(192.168.56.101)

可以看出，正是由于存在tcp.validnode_checking=yes才去检查tcp.invited_nodes定义的节点，将客户端ip地址192.168.56.1加入该文件中即可。

tcp.validnode_checking=yes

tcp.invited_nodes=(192.168.56.101,192.168.56.1)

"sqlnet.ora" 1118L, 32887C written

[oracle@oracle-one admin]$

由于操作的是正在运行的服务器，因此不能重启该监听，但是reload可以实现。

[oracle@oracle-one admin]$ lsnrctl

LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 01-NOV-2013 11:22:57

Copyright (c) 1991, 2013, Oracle.  All rights reserved.

Welcome to LSNRCTL, type "help" for information.

LSNRCTL> help

The following operations are available

An asterisk (*) denotes a modifier or extended command:

start               stop                status

services            version             reload

save_config         trace               spawn

change_password     quit                exit

set*                show*

LSNRCTL> reload

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle-one)(PORT=1521)))

The command completed successfully

LSNRCTL> exit

5)在客户端测试：

C:\Users\Administrator>tnsping rhys

TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 01-11月-

2013 11:23:14

Copyright (c) 1997, 2010, Oracle.  All rights reserved.

已使用的参数文件:

E:\softsetup\oracle_client\oracle_base\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名

尝试连接 (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.1

68.56.101)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = RHYS)))

OK (10 毫秒)

C:\Users\Administrator>

问题得到解决。