Open up Services from Control Panel and check for a service called OracleOraDb10g_homeTNSListener (yours may be called something slightly different). If the Status is blank, this means it has not been started. Right-click on the service and choose Start.
The second method of starting the listener is from the command prompt. Open a Command Prompt window and type:
lsnrctl statusIf you receive error messages about "TNS no listener," this means the listener has not been started. To start the listener from the command prompt, type:
lsnrctl startTry connecting with SQL*Plus on the database server by choosing Start-->All Programs-->Oracle-OraDb10g_home1-->Application Development-->SQL Plus. Note that it may take a minute or so for the database to register with the listener, so if this still fails, wait at least 60 seconds and then try again.
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