Able to connect from SQL-Assistant BUT unable to connect from Sql Developer

Hello,
I have been troubling with this issue for the last two weeks...tried so much, but could not able to resolve....
sqlplus username/password@IPAddress:port/ServiceName
I am able to connect to DATABASE from SQLAssistant only when I provide string like ABOVE........If I dont mention the SERVICE, m unable to connect to DB...
Now the biggest issue is with SQL Developer.....m not at all able to connect to DB using SQL Developer....I tried all options...but no use...
waiting for your reply......
Thanks Much in Advance.....

What have you tried, and what error messages are you getting?
When you create a connection in SQL Developer, you should specify IPAddress,port,ServiceName as in your sqlplus connect string.

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Able to connect from SQL-Assistant BUT unable to connect from Sql Developer

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