To set permission for shared Internet connection control

Open Network Connections.
Click the network connection on which Internet Connection Sharing (ICS) is enabled, and then, under Network Tasks, click Change settings of this connection.
On the Advanced tab, under Internet Connection Sharing, do one of the following:
To give network clients permission to control the shared Internet connection, select the Allow other network users to control or disable the shared Internet connection check box.
To revoke the permission of network clients to control of the shared Internet connection, clear the Allow other network users to control or disable the shared Internet connection check box.
Notes

To open Network Connections, click Start, click Control Panel, click Network and Internet Connections, and then click Network Connections.
Allow other network users to control or disable the shared Internet connection is enabled by default. Unless you clear the check box, control of the shared Internet connection is available to client computers. Other users on your network can disable or enable the current Internet connection for the entire network.
The Allow other network users to control or disable the shared Internet connection check box is independent of the Establish a dial-up connection whenever a computer on my network attempts to access the Internet check box.
If the Establish a dial-up connection whenever a computer on my network attempts to access the Internet check box is selected, when the ICS host detects a client's outbound Internet traffic, it connects to the Internet using the shared Internet connection. However, unless the Allow other network users to control or disable the shared Internet connection check box is selected, the client is unable to control when the connection connects or disconnects.
To enable Internet Connection Sharing (ICS) Discovery and Control on Windows 98, Windows 98 Second Edition, and Windows Millennium Edition computers, run the Network Setup Wizard from the CD or floppy disk on these computers. For more information about the Network Setup Wizard, click Related Topics.
For ICS Discovery and Control to work on Windows 98, Windows 98 Second Edition, and Windows Millennium Edition computers, Internet Explorer version 5.01 or later must be installed.