数据库连接如下：
[oracle@rxrac02 ~]$ sqlplus / as sysdbaSQL*Plus: Release 11.2.0.4.0 Production on Sun Feb 1 15:41:30 2026Copyright (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, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing optionsSQL> SHOW PARAMETER service_names;NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ service_names string orcl SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing options [oracle@rxrac02 ~]$ sqlplus system/oracle@orclSQL*Plus: Release 11.2.0.4.0 Production on Sun Feb 1 15:41:58 2026Copyright (c) 1982, 2013, Oracle. All rights reserved.ERROR: ORA-12537: TNS:connection closedEnter user-name: ^C^C
检查监听状态
[oracle@rxrac02 ~]$ lsnrctl statusLSNRCTL for Linux: Version 11.2.0.4.0 - Production on 01-FEB-2026 15:43:00Copyright (c) 1991, 2013, Oracle. All rights reserved.Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 11.2.0.4.0 - Production Start Date 01-FEB-2026 15:37:47 Uptime 0 days 0 hr. 5 min. 13 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora Listener Log File /u01/app/grid/diag/tnslsnr/rxrac02/listener/alert/log.xml Listening Endpoints Summary...(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.112.112)(PORT=1521)))(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.112.114)(PORT=1521))) Services Summary... Service "+ASM" has 1 instance(s).Instance "+ASM2", status READY, has 1 handler(s) for this service... Service "orcl" has 1 instance(s).Instance "orcl2", status READY, has 1 handler(s) for this service... Service "orclXDB" has 1 instance(s).Instance "orcl2", status READY, has 1 handler(s) for this service... The command completed successfully [oracle@rxrac02 ~]$
报错google查询
文章如下：
https://doyensys.com/blogs/ora-12537-while-connecting-to-database/
检查oracle文件权限
rac集群两个节点更改oracle文件权限
[root@rxrac02 ~]# ls /u01/app/oracle/product/11.2.0/db_1/bin/oracle /u01/app/oracle/product/11.2.0/db_1/bin/oracle [root@rxrac02 ~]# ls -l /u01/app/oracle/product/11.2.0/db_1/bin/oracle -rwxrwsr-x 1 oracle asmadmin 239501488 2月 1 00:08 /u01/app/oracle/product/11.2.0/db_1/bin/oracle [root@rxrac02 ~]# chmod 6751 /u01/app/oracle/product/11.2.0/db_1/bin/oracle [root@rxrac02 ~]# ls -l /u01/app/oracle/product/11.2.0/db_1/bin/oracle -rwsr-s--x 1 oracle asmadmin 239501488 2月 1 00:08 /u01/app/oracle/product/11.2.0/db_1/bin/oracle [root@rxrac02 ~]# ssh rxrac01 Last login: Sun Feb 1 15:32:55 2026 from rxrac02 [root@rxrac01 ~]# chmod 6751 /u01/app/oracle/product/11.2.0/db_1/bin/oracle [root@rxrac01 ~]#
发现oralce组权限多了一个w，修改后链接成功
[root@rxrac01 ~]# su - oracle 上一次登录：日 2月 1 15:27:46 CST 2026pts/0 上 [oracle@rxrac01 ~]$ [oracle@rxrac01 ~]$ [oracle@rxrac01 ~]$ [oracle@rxrac01 ~]$ sqlplus system/oracle@orclSQL*Plus: Release 11.2.0.4.0 Production on Sun Feb 1 15:51:15 2026Copyright (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, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing optionsSQL> SQL> SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing options [oracle@rxrac01 ~]$ sqlplus system/oracle@rac-scan:1521/orclSQL*Plus: Release 11.2.0.4.0 Production on Sun Feb 1 15:51:31 2026Copyright (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, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing optionsSQL> SQL> SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing options