关于Not logged on in pl/sql developer for oracle

测试环境：oracle12c+win10

用工具pl/sql developer ,以前连接好好的，现在突然不行了，经过多次测试，发现了问题所在
ORACLE_HOME变量对它的响应.
oracle client目录在D:\Program Files\oracle-client\ora90\
oracle安装在D:\app\orcl\product\12.1.0\dbhome_1\
A. 若用oracle工具，如配置监听什么的，将oracle_home改为oracle安装目录D:\app\orcl\product\12.1.0\dbhome_1，否则监听不正常
B. 若用pl/sql ,把oracle_home改为oracle client所在的目录D:\Program Files\oracle-client\ora90，不则报错误：Not logged on 

测试步骤：
1. 在服务中查看oracle后台数据库Listener是否正常启动.
2。测试监听是否正常：tnsping orcl
3. 连接数据库.

监听配置文件LISTENER.org：
# listener.ora Network Configuration File: D:\Program Files\oracle-client\orcl\listener.ora
# Generated by Oracle configuration tools.


SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = d:\app\orcl\product\12.1.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:d:\app\orcl\product\12.1.0\dbhome_1\bin\oraclr12.dll")
    )
    //有时不配置它不行
    (SID_DESC =
    (GLOBAL_DBNAME = ORCL)
    (ORACLE_HOME = D:\app\orcl\oradata\orcl)
    (SID_NAME = ORCL)
    )
  )


SID_LIST_ORCL =
  (SID_LIST =    
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\app\orcl\oradata\orcl)
      (PROGRAM = extproc)
    )
   (SID_DESC =
    (GLOBAL_DBNAME = ORCL)
    (ORACLE_HOME = D:\app\orcl\oradata\orcl)
    (SID_NAME = ORCL)
    )
  )


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


ADR_BASE_LISTENER = d:\app\orcl\product\12.1.0\dbhome_1\log

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
  )


ADR_BASE_ORCL = d:\app\orcl\product\12.1.0\dbhome_1\log

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


ORCL =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )


TST =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.187)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = TST)
    )
  )


SAP =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.187)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = TST)
   )
  )
server: win2003+oracle9i
 client端配置监听sap, tst,时，若出现ERROR:
ORA-12504: TNS: 监听程序在 CONNECT_DATA 中未获得 SERVICE_NAME
需要将环境变量：
TNS_ADMIN=D:\Program Files\oracle-client\ora90 去掉.