VB.NET:无法从客户端应用程序连接到Oracle数据库服务器

我有两台笔记本电脑(A和B)在同一个本地网络(Wi-Fi)上。

我已经在笔记本电脑A上安装了Oracle数据库12c r2。

在笔记本电脑A中,我使用Visual Studio 2017创建了一个VB.NET应用程序,可以连接到Oracle数据库。

该应用程序在笔记本电脑A上运行良好。它连接到数据库,这是我的应用程序表单,我使用的连接字符串(192.168.20.98是我的笔记本电脑的IP地址):

oracle_connection = New OracleConnection(
    "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=" & protocol.Text &
    ")(HOST=" & host.Text & ")(PORT=" & port.Text &
    ")))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=" & db_name.Text &
    ")));User Id=" & user_id.Text & ";Password=" & pswd.Text)

我还编辑了我的 listener.ora tnsnames.ora 位于 C:\app\mustafa\product\12.2.0\dbhome_1\network\admin 详情如下:

listener.ora

# listener.ora Network Configuration File: 
C:\app\mustafa\product\12.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\mustafa\product\12.2.0\dbhome_1)
(PROGRAM = extproc)
(ENVS = 
"EXTPROC_DLLS=ONLY:C:\app\mustafa\product\12.2.0\dbhome_1\bin\oraclr12.dll")
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.20.98)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)

特斯奈姆斯·奥拉 :

# tnsnames.ora Network Configuration File: 
C:\app\mustafa\product\12.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

DB1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.20.98)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = db1)
)
)

LISTENER_DB1 =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.20.98)(PORT = 1521))


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

我已编辑了我的Oracle主文件夹,以授予 authenticated users

System.Data.OracleClient需要Oracle客户端软件版本8.1.7或更高版本。

我找不到任何解决办法。我的笔记本电脑B上是否也需要安装Oracle数据库12c r2?