RAC 客户端连接TNS-12547: TNS: 丢失连接

在sqlnet.ora文件中将tcp.validnode_checking的值设为no。然后重v刹启数据库与服务就可以了。

mos上面解释
 oracle e-business suite release 11.5.10 introduced support for the oracle net security feature, tcp.validnode_checking, which is used to prevent unauthorized oracle net access (for example via sql*plus) to the applications database. if a node or pc is not registered, the connection attempt will fail with the error ora-12537: tns: connection closed.
 
第一种方法
 第一种
 在sqlnet.ora文件中将tcp.validnode_checking的值设为no。然后重v刹启数据库与服务就可以了。
 
第二种方法 
客户，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：
 1）查看客户端tnsname.ora文件信息如下：# tnsnames.ora network configuration file: e:oracleetworkdminnsnames.ora
  # generated by oracle configuration tools.
  rhys =
    (description =
      (address_list =
        (address = (protocol = tcp)(host = 192.168.20.1)(port = 1521))
      )
      (connect_data =
        (service_name = test)
      )
    )
 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 11:19:35copyright (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 “test” has 1 instance(s).
    instance “test”, status ready, has 1 handler(s) for this service…
  service “rhysxdb” has 1 instance(s).
    instance “test”, 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 2013copyright (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      test
  sql>
正常
 3）在客户端使用tnsping：
 c:usersdministrator>tnsping rhystns ping utility for 32-bit windows: version 11.2.0.1.0 – production on 01-11月-
 2013 11:10:05copyright (c) 1997, 2010, oracle.  all rights reserved.已使用的参数文件:
 e:softsetuporacle_clientoracle_baseetworkdminsqlnet.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
  68.20.1)(port = 1521))) (connect_data = (service_name = test)))
  tns-12547: tns: 丢失连接
 c:usersdministrator>
 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]$
  lsnrctllsnrctl for linux: version 11.2.0.4.0 – production on 01-nov-2013 11:22:57copyright (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:usersdministrator>tnsping rhys
 tns ping utility for 32-bit windows: version 11.2.0.1.0 – production on 01-11月-
 2013 11:23:14copyright (c) 1997, 2010, oracle.  all rights reserved.已使用的参数文件:
 e:softsetuporacle_clientoracle_baseetworkdminsqlnet.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:usersdministrator>
 问题得到解决

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