本人的问题已解决，先在安装oracle的服务器上黑窗口输入tnsping，提示说no listener，这是监听服务没有打开。 打开服务后还是不行，最后原因是服务器的网络有防火墙的问题，关掉防火墙连接成功

第一反应是监听没开：

测试了一下， 连接超时没用ping 通

C:\Users\Administrator>tnsping brorcl

TNS Ping Utility for 64-bit Windows: Version 11.2.0.1.0 - Production on 15-6月 -2015 09:45:43

Copyright (c) 1997, 2010, Oracle.  All rights reserved.

已使用的参数文件: D:\oracle\product\11.2.0\dbhome_1\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名 尝试连接 (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.14.147.112)(PORT = 42525)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = brorcl))) TNS-12535: TNS: 操作超时

我登陆到远程服务器上，查看了一下监听的状态

C:\Documents and Settings\Administrator>lsnrctl status

LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 15-6月 -2015 09:52:54

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

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521))) STATUS of the LISTENER

Alias                     LISTENER Version                   TNSLSNR for 64-bit Windows: Version 11.2.0.1.0 - Production Start Date                15-6月 -2015 09:36:02 Uptime                    0 days 0 hr. 16 min. 55 sec Trace Level               off Security                  ON: Local OS Authentication SNMP                      OFF Listener Parameter File   F:\app\Administrator\product\11.2.0\dbhome_1\network\admin\listener.ora Listener Log File         F:\app\Administrator\product\11.2.0\dbhome_1\network\log\listener.log Listening Endpoints Summary...   (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.\pipe\EXTPROC1521ipc)))   (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=x3650m3)(PORT=47512)))   (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=47512))) Services Summary... Service "BANKASSIST" has 1 instance(s).   Instance "brorcl", status READY, has 1 handler(s) for this service... Service "CLRExtProc" has 1 instance(s).   Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service... Service "brorcl" has 2 instance(s).   Instance "brorcl", status UNKNOWN, has 1 handler(s) for this service...   Instance "brorcl", status READY, has 1 handler(s) for this service... Service "brorclXDB" has 1 instance(s).   Instance "brorcl", status READY, has 1 handler(s) for this service... The command completed successfully

看到监听也正常，本地连接进去也很正常。

我想了一下本地能访问远程连接不上是不是防火墙问题，于是我关闭了windows防火墙，果然在远程tnsping 能ping通了；

结果：应该是防火墙有改动了，最后把 服务器防火墙的 ip和端口添加为例外，应用恢复正常了。

总结： 一般遇到tns 的问题通常都是监听或者是网络问题           1. 查看监听是否正常           2. 查看 ip 或端口有没有改动           3. 查看防火墙