2 db instances on 1 NT server can't connect to one from client

I have 2 db instances loaded on an NT server. On the server i can connect to both with sqlplus.
on the client i can connect to only 1 of the instances. i have 1 listener for both instances. i copied server side tns and sql .ora's to all my client side directories (as i have 2 oracle homes) and this doesnt work getting the follownig error consitantly ORA- 12545 connect failed because target host or object does not exist. chaned host name in tns to ip address of host and still get same error is this an NT thing or a SQLNET thing ?????

any assitance would by helpful. Received on Wed Feb 21 2001 - 12:57:18 CST