在Centos 7上完成Oracle 12c的安装后，现在我尝试允许在我的PC上（通过SQL Delopper）访问服务器 . 但问题是当我这样做时：

lsnrctl status

我收到此错误：

TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 2: No such file or directory

所以，我尝试用以下方式启动监听器：

lsnrctl start

我收到这个错误：

TNS-01198: Listener failed to initialize valid node list
 NL-07007: internal error
  NL-00408: cannot find or read value
   NL-00408: cannot find or read value
    NL-00408: cannot find or read value

为了完成我去这个网站：https://wiki.scn.sap.com/wiki/display/ORA/TNS-01198%3A+Listener+failed+to+initialize+valid+node+list+post+upgrade+from+11g+to+12c

然后我添加了，因为他告诉listener.ora文件中的以下行

VALID_NODE_CHECKING_REGISTRATION_<LISTENER_SERVICENAME> = OFF

但没有变化 .

To finish, this is my listener.ora file:

#listener.ora Network Configuration File: /home/oracle/app/oracle/product/12.1.0/dbhome_1/network/admin/listener.ora

#Generated by Oracle configuration tools.

VALID_NODE_CHECKING_REGISTRATION_<LISTENER_SID> = OFF


LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
       (ADDRESS = (PROTOCOL = TCP)(HOST =  84.254.25.9)(PORT = 1521))

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

有没有人有办法解决吗？

oracle remote-access oracle12c