服务器上安装了oracle11g , 防火墙上已经增加1521 入站规则。但是内网客户端配置好了TNS无法连接。telnet 1521 不通。

需要在服务器上\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora 修改

原来是：

LISTENER =      (DESCRIPTION =        (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))      )

修改为：

LISTENER =      (DESCRIPTION =        (ADDRESS = (PROTOCOL = TCP)(HOST =IP地址或机器名称)(PORT = 1521))      )

 PLSQL Developer 连接时：ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务

新增一个：SID_DESC  ORCL是服务名。注意区分大小写

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