Got "closed connection" via OEM 10.1.0.2.0

Hello,
please help.....
I installed OEM version 10.1.0.2.0 on windows 2000 PC. All the database instances are displayed under Network Navigator. when i log on to the database either as normal / sysoper /sysdba, I got "closed connection" error right after clicked OK on the login window.
can anyone give me suggestion/ references to this issue?
many thanks.

Check firewall configurations on the PC to see if it is blocking the Listener port 1521. Also check the setting of SQLNET.AUTHENTICATION_SERVICES = in $ORAACLE_HOME/network/admin/sqlnet.ora

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    ln -s /mnt/yourmountfolder/boot
    ln -s /mnt/yourmountfolder/etc
    lilo
    (if there's an other, easyer way to install lilo, let me know)
    and then reboot...

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