Where did "@actdat" go?

Hi Michel,

My Database name is ORDTRACK and Service Name is actdat.
If i need to export, I usually login using: system/manager@actdat
i.e.

c:\>exp

Export : Release 8.1.7.0.0 - Production on Wed Jun 9 16:17:53 2010

(c) copyright 2000 oracle corporation. All rights reserved.

username: system/manager@actdat

EXP-00056: Oracle error 1017 encountered
ORA-01017: Invalid username/password; logon denied


----------------------------------------------------------

If i try connecting using system/manager without specifying the conection string it is accepting. But the problem is that when i try to export not all the tables in my database are being exported.

Also if I connect to SQL Plus without specifying the Host string, I am able to connect. I type Username as 'system' and Password as 'manager'.


--------------------------------------------------------------

This is my tnsnames.ora file in the Client machine

# TNSNAMES.ORA Network Configuration File: D:\oracle\ora81\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = x.x.x.116)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = actdat)
(PRESENTATION = http://admin)
)
)

actdat =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = x.x.94.59)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = ordtrack)
)
)

testprod =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = x.x.x.x)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = testprod)
)
)

test =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = x.x.x.45)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = test)
)
)

---------------------------------------------------------------

This is also my tnsnames.ora file in the Server

# TNSNAMES.ORA Network Configuration File: F:\oracle\ora81\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

ORDTRACK =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = server)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = Ordtrack)
)
)

INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = server)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = Ordtrack)
(PRESENTATION = http://admin)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

-------------------------------------------------------------

Any kind of help will be appreciated.
Rgds
Obwaka.