Issue when connecting to database from SQL Developer tool

Hi,
I was trying to connect to a remote oracle database 10.2.0.5 (hosted at window 2008 R2 server) from my local SQL Developer tool.
When setting up connection in SQL Developer tool, I was able to connect to the database by selecting TNS (Network Allias).
However, it does not work when I choose Basic type with the same information (HOST, PORT, SID).
What is the difference between TNS and Basic setting option? Please advise and assist.
Thanks.
Regards,
Jia

Hi JimSmith,
Thanks for reply.
TNS entry as below:
ORCL_DB =
(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 91.198.252.83)(PORT = 1521)) )
(CONNECT_DATA = (SID = orcl) (SERVER = DEDICATED) ) )
It works fine if I choose TNS (Network Allias: ORCL_DB).
For the Basic setting:
Hostname = 91.198.252.83
Port = 1521
SID = orcl
The error I received when connecting to db based on Basic option is Failure -Io exception: The Network Adapter could not establish the connection.
Below are the entries of SQLnet.ora. Any entry should I add into sqlnet.ora?
SQLNET.AUTHENTICATION_SERVICES= (NONE)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
Appreciate your comment.
Thanks.
Regards,
Jia

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