plsql连接oracle 11g 本地能连接上，远程连接不上，错误码：ORA-12541 TNS 无监听程序

注意：我本地安装oracle11gR2 64位，桌面类；

• 我本地安装目录：D:\app\ELONG\

解决办法：

1. 修改D:\app\ELONG\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora，修改host=为你本机的IP地址，远程通过IP访问；

• 修改前listener.ora,如下:

• # listener.ora Network Configuration File: D:\app\ELONG\product\11.2.0\dbhome_1\network\admin\listener.ora
  # Generated by Oracle configuration tools.
  
  SID_LIST_LISTENER =
    (SID_LIST =
      (SID_DESC =
        (SID_NAME = CLRExtProc)
        (ORACLE_HOME = D:\app\ELONG\product\11.2.0\dbhome_1)
        (PROGRAM = extproc)
        (ENVS = "EXTPROC_DLLS=ONLY:D:\app\ELONG\product\11.2.0\dbhome_1\bin\oraclr11.dll")
      ) 
    )
  
  LISTENER =
    (DESCRIPTION_LIST =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
        (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
      )
    )
  
  ADR_BASE_LISTENER = D:\app\ELONG

• 修改后listener.ora

# listener.ora Network Configuration File:  D:\app\ELONG\product\11.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = D:\app\ELONG\product\11.2.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:D:\app\ELONG\product\11.2.0\dbhome_1\bin\oraclr11.dll")
    ) 
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.27.135)(PORT = 1521))
    )
  )

ADR_BASE_LISTENER = D:\app\ELONG

2. 修改D:\app\ELONG\product\11.2.0\dbhome_1\NETWORK\ADMIN\tnsnames.ora，修改host=为你本机的IP地址，远程通过IP访问；

• 修改tnsnames.ora前：

# tnsnames.ora Network Configuration File: D:\app\ELONG\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

SYDJ =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SYDJ)
    )
  )

ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

LISTENER_SYDJ =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))

• 修改tnsnames.ora后：

# tnsnames.ora Network Configuration File: D:\app\ELONG\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

SYDJ =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SYDJ)
    )
  )

SYDJ2 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.27.135)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SYDJ)
    )
  )

ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

LISTENER_SYDJ =
  (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
LISTENER_SYDJ2=
  (ADDRESs = (PROTOCOL = TCP)(HOST=192.168.27.135)(PORT=1521))

结果：

• 现在可以通过远程连接到192.168.27.135这台oracle数据库；

注意：

192.168.27.135为本地电脑在局域网中的内网IP，当换成其他网络时，这个IP也便不会存在，此时若前面两个配置文件依旧那么写，则在启动Oracle的监听器服务时，会报错：

本地计算机上的OracleOraDb11g_home1TNSListener服务启动后停止。某些服务在未由其它服务或程序使用时将自动停止。

解决方法：

将上面两个配置文件恢复原样，即将有关这个内网IP192.168.27.135的部分全部删掉并保存，便可解决问题。