Oracle 10g Remote Reolocation issues - TNS Listner

I have just had to move a windows server to a collocated location and am having problems connecting to the Oracle 10g Database on that machine remotely from my development machine via SQL plus or OEM.

Error: TNS-12541: TNS:no listener

Pinging the remote database machine from my development machine is successful
TNSPing shows the no listener error
local tnsping behind firewall results "OK (10 msec)"

I have changed the tnsnames.ora to contain the new ip number on my development machine and opened the remote firewall for the port I am using.

Do I need to also update ora files on the Remote Database machine.

The remote setup is up and running fine with all connections to the Database fine in that location. (ie behind the firewall and on the local network)...

Currently:

Dev Machine (location 1) tnsnames.ora

BCS.GORDON =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ***.***.***.***)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = bcs.gordon)
    )
  )

Remote Database (location 2) listener.ora

# listener.ora Network Configuration File: D:\oracle\product\10.2.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

LISTENER_GORDON =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gordon)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    )
  )

SID_LIST_LISTENER_GORDON =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )
  )


Remote Database (location 2) tnsnames.ora

BCS.GORDON =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = Gordon)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = bcs.gordon)
    )
  )


Any guidance would be appreciated