cognos，数据源链接测试失败，如何解决？

本人使用的环境是win7+cognos8.4+oracle11，按照视频教程一步步操作，在framework,create一个项目然后配置数据源的时候，测试链接失败，失败原因见截图。我也看了很多网上关于测试链接失败的帖子，问题还是无法解决。对于sql*net连接字符串，我也找到了：
# tnsnames.ora Network Configuration File: E:\app\Administrator\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

COGNOS =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = cognos)
)
)

LISTENER_COGNOS =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


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

ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
照理来说也没问题。可是就是连接不上。但是在cognos configuration中的IBM COGNOS CONTENT STORE中测试链接是成功的。但是user id and password和database naem (cm)这些个是默认的。
希望天山上的童姥们帮我解决下这个问题，万分感谢！！！