TNS-12535: TNS:operation timed out 一例

有两台服务器，windows7和oracle enterprise linux 5.7,上面都装有oracle 10.2.1，现在要在上面做物化视图实验并建dblink，所以需要创建服务名，两节点的tnsnames.ora中都加有如下代码：

WIN7 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.35)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = newdb)
    )
  )

OEL5 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.84)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = oel)
    )
  )

在windows7上tnsping的结果：

C:\Users\mdu>tnsping win7

TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 30-8月 -
2012 14:12:35

Copyright (c) 1997, 2005, Oracle.  All rights reserved.

已使用的参数文件:
E:\oracle\product\10.2.0\db_1\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = 192.168.0.35)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = newdb)))
OK (20 毫秒)

C:\Users\mdu>tnsping oel5

TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 30-8月 -
2012 14:12:41

Copyright (c) 1997, 2005, Oracle.  All rights reserved.

已使用的参数文件:
E:\oracle\product\10.2.0\db_1\network\admin\sqlnet.ora

已使用 TNSNAMES 适配器来解析别名
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
(HOST = 192.168.0.84)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = oel)))
OK (20 毫秒)

在linux上tnsping的结果：

[oracle@oel5 ~]$ tnsping win7

TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 30-AUG-2012 14:13:26

Copyright (c) 1997, 2005, Oracle.  All rights reserved.

Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.35)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = newdb)))
TNS-12535: TNS:operation timed out  ############ 很奇怪，反过来就ping不通了，怪不得建的dblink连不上！

[oracle@oel5 ~]$ tnsping oel5

TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 30-AUG-2012 14:13:21

Copyright (c) 1997, 2005, Oracle.  All rights reserved.

Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.84)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = oel)))
OK (20 msec)

最后查了N多资料看了N多个案例，才找到根本原因，我的windows 防火墙没有关，关掉之后一切都ok了！

 

高级复制之路上的插曲----谨以记之！