Windows 2000 supports both Network Address Translation (NAT) and Internet
Confection Shading (ICS) al1ow workgroup users to access to the Internet..
Windows 2000/XP Professional support only ICS.
Sharing (ICS) enables a Windows (Win98SE, Win2K and XP) computer to share its
Internet connection with computers on local area networks.
The computer connecting directly to the Internet
and shares its connection with the rest of the computers on the network called
the ICS host. In addition, the ICS host provides DHCP to ICS clients. Client
computers are protected because they cannot be seen from outside the network.
Only the computer running ICS is seen from the public side.
1. Network settings must be set Obtain IP
Address Automatically - to do this, go to Network>Properties of TCP/IP.
2. The Internet browser should se set never dial a connection and no proxy
server - go to Internet Options>Connection and LAN settings.
ping other computer and Internet but not default gateway IP
Symptoms: you are running ICS on XP and all networking
computers can access the Internet. Problems: 1) you can't access the ICS
host. 2) you can ping other networking computers and Internet IP but not ICS
host. 3) when using tracert (public) ip, the default gateway, ICS, is time
out. After passing the gateway, all IPs reply.
Resolutions: 1) disable ICF. 2) there is firewall
running and you may need to disable.
For step by step setup ICS, visit
"Cannot enable shared access" while setup ICS
SYMPTOMS: When you try to enable ICS on your
Win2K/XP on a network, you may receive the following error message:
"Cannot enable shared access." and "Error 783: Internet Connection Sharing
cannot be enabled.
RESOLUTION: When you enable ICS, your
computer is assigned the 192.168.0.1 IP address, and if this address is
already in use on another computer, the error message listed earlier in this
article is generated. To work around this problem, disconnect the computer
using the 192.168.0.1 IP address from the network, or change its IP address
to something other than 192.168.0.1.
Cannot enable ICS
1. ICS cannot be used and will not be shown if you have enabled a network
2. There are at least two enabled, connected network connections.
3. Make sure ICF is disabled on the LAN connection.
Can't access the Internet by name through the NAT enabled server
Symptom: you set up NAT on your Routing and
Remote Access server. The users can connect to the Internet using IP
addresses but not the web site name. How can you fix it?
Resolution: on the properties dialog box of
the NAT server in the Routing and Remote Access console, check the Clients
Using Domain Name System under the Name Resolution tab.
Client with Static IP can't access the
Many people have a difficulty to make static IP client
to work with ICS. The client and host can ping each other but not Internet.
Since the client is assigned static IP so that it also need to be assigned
the DNS manually. To do that, go to properties of TCP/IP>Advanced>DNS to add
your ISP DNS.
dial-up runs automatically after another computer logon
Symptoms: after you setup ICS on an XP dial-up connects to the internet,
the dial-up connects to the ISP automatically whenever a user logs on to
another XP box on the network (without running IE).
Resolution: there are some applications such as MS messenger and
Anti-Virus Live Update that may be trying to access the internet on boot.
For this reason, by default the ICS connection will connect to the internet
when there is any traffic from the network. To disable this feature, open the
Network Connections folder and right-click on the connection that is shared.
Click the advanced tab and uncheck the "Establish a dial-up connection
whenever a computer on my network attempts to access the internet". If you
make this change then you will have to connect to the internet manually from
the ICS box so that others can use it.
Symptom: you setup ICS for other LAN clients to access the Internet. As long
as you logon, it works. After the you logs off, the LAN clients can't
establish a connection any more
Resolution: This behavior can occur if the user saves the password before
establishing the shared connection. That password and the ICS password are
saved in different registry locations. When a LAN client tries to log on,
the system looks in the ICS password key, finds no password, and denies
access. To fix this problem, delete and then recreate the connection,
without setting the username or password from the LAN clients. After you
establish the connection, click to select the Save Password
check box when you log on.
1. When you have a server running DHCP or Dynamic DNS, ICS
service may not function correctly or may cause some services to stop
working. In addition, various error messages may be caused.
2. Windows 2000/2003 Server provides more robust internet
sharing utility called Network Address Translation. The NAT has additional
features that may make it a better than ICS in a server or domain
ICS Host can
The ICS Host can automatically assign IP addresses to internal network
clients. You may want to use this functionality if you do not have a DHCP
SYMPTOMS: When you view the ICS Adapter in
Device Manager, you may see a yellow exclamation point. This issue can occur
if you do not run the ICS Setup wizard after you install Windows.
RESOLUTION: 1) To resolve this issue, run the
ICS Setup wizard. To do this, go to the Connections
properties, click Sharing. 2) If the ICS Adapter is not in
Device Manager, you must reinstall ICS. To do this, go to Add/Remove
Programs>Windows, uncheck Internet Tools
first. After rebooting, recheck Internet Tools.
ICS doesn't show under Advanced
To enable ICS, you must have two NICs. Otherwise, you
won't be able to enable ICS and you even can't see this option. If you do
have two NICs instilled on your computer, make sure none of them is disabled.
It is not recommended to setup ICS to uses static IP; to be on a domain
controller, VPN, DNS servers, gateways, or DHCP servers.
Symptoms if ICF is
enabled on the LAN connection
1. You may receive "System error 6118 has occurred. The list of servers
for this workgroup is not currently available" or "System error 53. The
network path was not found" message if using net view command on local
computer and net view \\icfcomputer or net
use \\icfcomputer from remote computer.
2. You may receive "Workgroup/ICF Computer is not accessible. You might not
have permission to use this network resources. Contact the Administrator of
this server to find out if you have access permission. The network path was
not found." message when click the Workgroup or the ICF computer (ICS
computer is listed here because the cache) from ICF computer or remote
3. Can't ping the ICF computer by IP or name.
4. Browstat.exe shows no master browser.
5. Can't ICS computer web site.
ZoneAlarm Firewall Issue
If you are using ZoneAlarm Firewall, that may be the
problem for the ICS.