TNS names can't be resolved

Hi All!
I try to connect to a database and the error message that TNS names can't be resolved. tnsnames.ora is copied from the PC where the connection works. Only one instance of Oracle client (9.2) is installed. I tried to add a TNS names in Net Assistent. It worked and the test within the assistent was successfull. The tnsnames.ora was also adjusted. But! I don't see the service in NetManager and I can't add any service there. The NT user is a member of the administrator group. I also try to connect using SQL plus, Excel, Enterprice manager - it doesn't work. Any ideas?
Is there any Windows service for the TNS? How it calls? I tried to check it with lsnrctl status but the command is not exist. Only client is installed on the PC.
Thanks,
Andrej

If you copied it from another PC then check that you have the correct entries in sqlnet.ora
For instance, in sqlnet.ora, if the parameter NAMES.DEFAULT_DOMAIN=yourserver_name.domain_name is not in use (commented out) and your net service name in[b] tnsnames.ora is mydb.yourserver_name.domain_name , when you try connecting with mydb as the connect string, you will get that error.
To resolve that, you either enter the connect string as mydb.yourserver_name.domain_name or uncomment NAMES.DEFAULT_DOMAIN in sqlnet.ora(add it if it does not exist) or change the net service name intnsnames.ora to mydb

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Message was edited by:
user468179

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Thanks.

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(Sorry,I speak English a little.)
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T.,
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