Connect to the Database using TOAD

Hi
I've installed 11.5.10.2 on and using DB 9.2.0.6.0 on Redhat 4 everything works ok.
but when i try to connect to TOAD i get this error ORA-12537 TNS:connection closed.
do i have to do any setup's?
please help.
Thanks

You need to register your host through OAM or disable the SQLNet restriction so that you can connect to the database. Check the following note for more details:
Note: 291897.1 - 11.5.10 New Features : Managed SQL*Net Access from Hosts
https://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=291897.1

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    D:\>set NLS_LANG=AMERICAN_AMERICA.WE8MSWIN1252
    D:\>sqlplus /nolog
    SQL>connect sysman/password

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