Oracle 11g cannot configure the resolution of the listening problem ____oracle

This is a rare situation, but I hope to give some help to the friend who is experiencing this problem.

Issue: The fourth step in creating an Oracle 11g database using the database Configuration Assistant is to create the Enterpeise Manager. This first requires a listener program to be established. The problem is that when I set up the listening port, I said 1521 the default port is occupied, but I still say that any port is occupied.

Reason: Is installed on the notebook, has 1394, the wireless network card and the wired network card, additionally installs the virtual machine, simulates the VMNET1 and VMnet8 two network connections. To conserve computer resources, I have banned 3 services for virtual machines: VMware Agent Service, VMware Authorization Service, VMware DHCP Service, and VMware NAT service. Oracle's default is to check the virtual machine's network connection ... The problem is obvious, these services are not turned on, and naturally no network connection is found. Therefore, Oracle believes that the network is not set, so the port error.

Solution: Multiple network adapters when setting up Enterpeise Manager, it is recommended that you disable other network connections and set an IP address for that network connection that is enabled. This will make it possible to create a listener.