PLSQL報錯： ORA-12170:TNS connect timeout occurred

本人的問題已解決，先在安裝oracle的服務器上黑窗口輸入tnsping，提示說no listener，這是監聽服務沒有打開。
打開服務后還是不行，最后原因是服務器的網絡有防火牆的問題，關掉防火牆連接成功

第一反應是監聽沒開：

1. 測試了一下， 連接超時沒用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.

已使用的參數文件:
D:\oracle\product\11.2.0\dbhome_1\network\admin\sqlnet.ora

已使用 TNSNAMES 適配器來解析別名
嘗試連接 (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.14.147.112)(PORT = 42525)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = brorcl)))
TNS-12535: TNS: 操作超時

2. 我登陸到遠程服務器上，查看了一下監聽的狀態

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

看到監聽也正常，本地連接進去也很正常。

3. 我想了一下本地能訪問遠程連接不上是不是防火牆問題，於是我關閉了windows防火牆，果然在遠程tnsping 能ping通了；

4. 結果：應該是防火牆有改動了，最后把 服務器防火牆的 ip和端口添加為例外，應用恢復正常了。

總結： 一般遇到tns 的問題通常都是監聽或者是網絡問題
          1. 查看監聽是否正常
          2. 查看 ip 或端口有沒有改動
          3. 查看防火牆

————————————————
原文鏈接：https://blog.csdn.net/zhengwei125/article/details/46535437