ORA-12537: TNS:connection closed - 数据库编程

报错：ORA-12537: TNS:connection closed 。

环境：

OS：LINUX 5.6

环境：RAC

NODE1：10.20.31.36

NODE2：10.20.31.38

[oracle@ract1 ~]$ sqlplussys/oracle@10.20.31.36:1521/racdbas sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Tue Jan 15 16:19:04 2013

ERROR:
ORA-12537: TNS:connection closed

使用同样的监听，登陆ASM实例却可以

[oracle@ract1 ~]$ sqlplussys/oracle@10.20.31.36:1521/+ASMas sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Tue Jan 15 16:32:29 2013

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Real Application Clusters and Automatic Storage Management options

SQL>

登陆到节点二也没问题

[oracle@ract1 ~]$ sqlplussys/oracle@10.20.31.38:1521/racdbas sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Tue Jan 15 16:33:46 2013

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL>

监听的配置：

[oracle@ract1 admin]$ cat sqlnet.ora
# sqlnet.ora.ract1 Network Configuration File: /grid/product/11.2.0/network/admin/sqlnet.ora.ract1
# Generated by Oracle configuration tools.

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

ADR_BASE = /grid/app

#tcp.validnode_checking = yes

[oracle@ract1 admin]$ cat listener.ora
LISTENER=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))) # line added by Agent
# listener.ora.ract1 Network Configuration File: /grid/product/11.2.0/network/admin/listener.ora.ract1
# Generated by Oracle configuration tools.

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER_SCAN1 = ON

ENABLE_GLOBAL_DYNAMIC_ENDPOINT_LISTENER = ON

LISTENER_SCAN1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = LISTENER_SCAN1))
)
)

监听状态：

[oracle@ract1 ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 15-JAN-2013 16:40:42

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date 15-JAN-2013 16:06:59
Uptime 0 days 0 hr. 33 min. 43 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /grid/product/11.2.0/network/admin/listener.ora
Listener Log File /grid/app/diag/tnslsnr/ract1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.20.31.36)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.20.31.37)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "racdb" has 1 instance(s).
Instance "racdb1", status READY, has 1 handler(s) for this service...
Service "racdbXDB" has 1 instance(s).
Instance "racdb1", status READY, has 1 handler(s) for this service...
The command completed successfully

报ORA-12537: TNS:connection closed 时候的日志如下：

[grid@ract1 alert]$ pwd
/grid/app/diag/tnslsnr/ract1/listener/alert
[grid@ract1 alert]$ cat log.xml
type='UNKNOWN' level='16' host_id='ract1'
host_addr='10.20.31.36' version='1'>
15-JAN

ORA-12537: TNS:connection closed(一)