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SQL Developer: "network adapter could not establish the connection"

648595 Newbie
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HELP!

I'M DESPERATE!!!

I installed Oracle 11g for the fist time and trying to connect to it with SQL Developer.
There is no problem connecting with SQL Plus.

The listener service is up. tnsnames.ora and listener.ora are correct (I presume!?)

ANYBODY who is using SQL developer with 11g please tell me what are you connection parameters and other things to check??

I use the same username and pw that I use in SQL Plus:
connection name: orcl
username: system
password: ***

Role: default
Hostname: localhost
Port: 1521
SID: orcl

when I ping:
ping localhost <-- responding
tnsping localhost <-- responding
tnsping orcl <-- responding

Ask me additional questions if necessary.

TIA
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