Uable to connect to database with new connection

we are not able to connect to DB using SQL DEVELOPER with new connection,exiting connects works fine and sql plus works fine as well.
anybody has any information u.
Thanks
RK

Thank you very much for reply.
Sql developer version: 1.5.1; oracle db is 10.2g.
existing connections we are connected thru SQL Developer itself before couple days back. if you close and try to reconnect it is just kept running runinng.
our connections use SID,port no, host name, we are not using the Tns.
Thanks in advance
RK

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