PLSQL连接Linux上的oracle数据库出现，ORA-12541 TNS 无监听程序

外部的PLSQL无法连接Linux上的oracle数据库，出现ORA-12541 TNS 无监听程序错误。待解决。

[oracle@OracleDB ~]$ lsnrctl status

LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 10-APR-2015 12:08:26

Copyright (c) 1991, 2009, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1522)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                10-APR-2015 11:31:11
Uptime                    0 days 0 hr. 37 min. 14 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /opt/oracle/11g/network/admin/listener.ora
Listener Log File         /opt/oracle/diag/tnslsnr/OracleDB/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1522)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=OracleDB)(PORT=1522)))
Services Summary...
Service "orc1XDB" has 1 instance(s).
  Instance "orc1", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
  Instance "orc1", status READY, has 1 handler(s) for this service...
The command completed successfully



tnsnames.ora文件
orc1 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = OracleDB)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = orc1)
    )
  )