Problem connecting through with ODBC driver

I have a virtual machine (Win XP SP3) running Oracle 11.1.0.7.0. The name of the machine is UK010862.uk.int.**********.com.
sqlnet.ora:
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= ( TNSNAMES, EZCONNECT)
tsnames.ora:
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = UK010862)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
I'm running this machine on a Windows 7 64bit dekstop which has Oracle InstantClient 11.2 installed.
When I set up an ODBC connection on the Oracle server with the TSN name (ORCL), it works fine, I can connect to the listener. When I do it with hostname:port it fails.
When I'm trying to connect from the Windows 7 machine, I can't connect at all. If I use the TSN name I get 'could not resolve the connect identifier specified' error. If I use the host:port I get 'listener was not given the SERVICE_NAME in CONNECT_DATA' error.
I checked that I can ping the two machines from both ends. I have the hostname in the hosts file. I checked that the 1521 port is listening with telnet. I also have the TSN_ADMIN environmental variable set to the folder where the tsnames.ora file is on the server.
What else am I possibly missing?
Many thanks

Sorted: tnsnames.ora file was missing on the client.

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