在區域網中遠端連線oracle時，一直提示拒絕連線，在確定防火牆關閉，oracle伺服器監聽埠開啟的情況下，可能的錯誤就是oracle的監聽IP地址不是預設的那樣，而是本地的127.0.0.1。

排錯過程不再細說，這裡只分享由於主機名不正確而導致oracle拒絕連線的解決辦法。

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修改hosts檔案

1. 開啟cmd，輸入hostname，記下主機名
2. 用記事本開啟c:\windows\system32\drivers\etc\hosts 檔案，新增主機名

# Copyright (c) 1993-2009 Microsoft Corp.
 

#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
 

# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host

# localhost name resolution is handled within DNS itself.
 

#    127.0.0.1       localhost
#    ::1             localhost
    [主機IP]          [主機名]

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修改oracle監聽檔案

1、開啟listener.ora，檔案在F:\app\young\product\11.2.0\dbhome_1\NETWORK\ADMIN 目錄下，將裡面的localhost換為自己的主機名。

# listener.ora Network Configuration File: F:\app\young\product\11.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

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

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = Young-PC)(PORT = 1521))//Young-PC原為localhost
) ) ADR_BASE_LISTENER = F:\app\young

2、修改tnsnames.ora，目錄同上，也將localhost更改為主機名。

# tnsnames.ora Network Configuration File: F:\app\young\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

LISTENER_ORCL =
  (ADDRESS = (PROTOCOL = TCP)(HOST = Young-PC)(PORT = 1521))//Young-PC原為localhost


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

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = Young-PC)(PORT = 1521))//Young-PC原為localhost
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

3、重啟tnslsnr。

開啟cmd，輸入以下命令。

lsnrctl stop
lsnrctl start
lsnrctl stat

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再次遠端連線，已經可以連上了，成功。