Had "closed connection" when connect via enterprise manager

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.

Have you already checked the windows firewall? If working, it prevents connections to Oracle from outside the box.

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