装完10g,无法在web访问enterprise manager

装完10g,无法在web访问enterprise managerUNIX下安装ORACLE 10G 成功, 想登录OEM,
HTTP://172.30.12.111:1158/em
无法显示.
命令行中,./emctl status dbconsole
显示:
oracle enterprise manager 10g is not running
执行:./emctl start dbconsole
显示:
-an instance of oracle enterprise manager 10g database control is already running.不明白是怎么回事?另外,在ORACLE_HOME/BIN中,没有发现APACHE,是不是在建立DATABASE时候没有选装OEM啊,
真是不明白了,请朋友们帮忙.先谢了.