Database timeout issue in oracle 11g 64 bit windows machine

Hi ,
Database connection getting timedout for every 30 seconds in oracle 11g database 64 bit windows environment.
And the error we are getting is "Invalid user name and passoword".
After altering the schema passoword
alter username identified by pwd;
we are able to connect to database but it is getting timedout after 30 seconds.
Is there any parameter settings that requires changes or verifications.
We are facing this using sqlplus as well as through JDBC connection.
Thanks
Prasanna

Check profile assigned to user... there is a parameter idle_time.. increase this..

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