Connecting to a oracle NT server from sun solaris client?

Hello,

        I am trying to connect from a sun solaris 2.4 box (client) to a Windows NT box running Oracle server. I am running into a lot of problems. It is hard for me to know what the problems are as I am not that familiar with Oracle. Any help or a step-by-step guide will be appreciated. Here are the details..

My loopback test on the NT box works fine. i.e. connect scott/tiger_at_t:kline/7560:ORCL works.

My /etc/services on unix side has
orasrv 7560/tcp

My files on unix look like this:
$ORACLE_HOME/network/admin/listener.ora
LISTENER=orasrv
 (ADDRESS_LIST=
(ADDRESS= (PROTOCOL=tcp) (HOST=kline) (PORT=7560))
(ADDRESS= (PROTOCOL=IPC) (KEY=kline)
  )
 )  

STARTUP_WAIT_TIME_LISTENER = 0
CONNECT_TIMEOUT_LISTENER = 10   SID_LIST_LISTENER=
 (SID_LIST=
(SID_DESC=

   (SID_NAME=ORCL)
   (ORACLE_HOME=/opt/oracle)
  )
 )  

TRACE_LEVEL_LISTENER = OFF
PASSWORD_LISTENER = (2CCDA1FA29BAD2A4) I get the following errors when I try connecting from Solaris.

connect scott/tiger_at_t:kline/7560:ORCL,conn-retries=5 ORA-06401: NETCMN: invalid driver designator

connect scott/tiger_at_nt
ORA-12203: TNS:unable to connect to destination

My $ORACLE_HOME/network/admin/tnsnames.ora file looks like: nt=
(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=tcp)

        (PORT=7560) (HOST=kline))))

Are there any files I missed??
Thanks in advance.

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