我使用oracle9i 的Net Manager測試資料庫的連線 都出現ORA-12541:no- listener 環境皆為預設值 請問這個問題要怎樣解決?

1. Oracle DB Server 有啟動嗎 ? 2. Firewall 是否擋住了 Oracle 使用的 port ? 3. client 和 server 間網路是否通? ping 看看

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ORA-12541: TNS:no listener Cause: The connection request could not be completed because the listener is not running. Action: Ensure that the supplied destination address matches one of the addresses used by the listener - compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to go by way of an Interchange). Start the listener on the remote machine.