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Oracle を初めて使用し、11g XE で Oracle 開発環境をセットアップしようとしています。ローカル接続は sqlplus と SQL Developer で正常に動作します - リモート接続はデータベースを認識できないようです。さまざまなマシンで以下のファイルのさまざまな構成を試しましたが (Google および Oracle ドキュメントの支援を受けて)、クライアントにサーバーの存在を登録させることさえできません。私の現在の構成は次のとおりです。

サーバー (ip 192.168.0.51):

リスナー.ora

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.51)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

tnsnames.ora

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.51)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

ORACLR_CONNECTION_DATA = 
  (DESCRIPTION = 
    (ADDRESS_LIST = 
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) 
    ) 
    (CONNECT_DATA = 
      (SID = CLRExtProc) 
      (PRESENTATION = RO) 
    ) 
  )

sqlnet.ora

# This file is actually generated by netca. But if customers choose to 
# install "Software Only", this file wont exist and without the native 
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES = (NONE)
NAMES.DIRECTORY_PATH=(TNSNAMES, EZCONNECT)

lsnrctl stat の出力

C:\Windows\system32>lsnrctl stat

LSNRCTL for 32-bit Windows: Version 11.2.0.2.0 - Production on 30-MAR-2015 18:31
:48

Copyright (c) 1991, 2010, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 11.2.0.2.0 - Produ
ction
Start Date                30-MAR-2015 17:58:16
Uptime                    0 days 0 hr. 33 min. 36 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Default Service           XE
Listener Parameter File   C:\oraclexe\app\oracle\product\11.2.0\server\network\a
dmin\listener.ora
Listener Log File         C:\oraclexe\app\oracle\diag\tnslsnr\Enterprise\listene
r\alert\log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.51)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.51)(PORT=8080
))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "XEXDB" has 1 instance(s).
  Instance "xe", status READY, has 1 handler(s) for this service...
Service "xe" has 1 instance(s).
  Instance "xe", status READY, has 1 handler(s) for this service...
The command completed successfully

netstat -an | の出力 「1521」を見つける

C:\Windows\system32>netstat -an | find "1521"
  TCP    192.168.0.51:1521      0.0.0.0:0              LISTENING
  TCP    192.168.0.51:1521      192.168.0.51:3280      ESTABLISHED
  TCP    192.168.0.51:3280      192.168.0.51:1521      ESTABLISHED

サーバー上で次のように接続できます（これが意味があるかどうか、つまりtcp経由かどうかはわかりません）：

sqlplus <user>/<pass>@192.168.0.51:1521/xe

クライアント：

クライアントで上記の sqlplus 接続を試行すると、次のようになります。

C:\>sqlplus <user>/<pass>@192.168.0.51:1521/xe

SQL*Plus: Release 11.2.0.1.0 Production on Mon Mar 30 18:14:17 2015

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

ERROR:
ORA-12170: TNS:Connect timeout occurred

Test-NetConnection の使用

PS C:\Users> Test-NetConnection 192.168.0.51 -Port 1521
WARNING: TCP connect to 192.168.0.51:1521 failed


ComputerName           : 192.168.0.51
RemoteAddress          : 192.168.0.51
RemotePort             : 1521
InterfaceAlias         : Wi-Fi
SourceAddress          : 192.168.0.88
PingSucceeded          : True
PingReplyDetails (RTT) : 1165 ms
TcpTestSucceeded       : False

ポート 1521 以外の診断

PS C:\Users> ping 192.168.0.51

Pinging 192.168.0.51 with 32 bytes of data:
Reply from 192.168.0.51: bytes=32 time=5ms TTL=128
Reply from 192.168.0.51: bytes=32 time=7ms TTL=128
Reply from 192.168.0.51: bytes=32 time=4ms TTL=128
Reply from 192.168.0.51: bytes=32 time=32ms TTL=128

Ping statistics for 192.168.0.51:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 4ms, Maximum = 32ms, Average = 12ms

PS C:\Users> Test-NetConnection 192.168.0.51 -Port 80


ComputerName           : 192.168.0.51
RemoteAddress          : 192.168.0.51
RemotePort             : 80
InterfaceAlias         : Wi-Fi
SourceAddress          : 192.168.0.88
PingSucceeded          : True
PingReplyDetails (RTT) : 1920 ms
TcpTestSucceeded       : True

サーバー マシンとクライアント マシンの両方でファイアウォールを無効にしました。

どこで間違っている可能性がありますか？

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