In the below shown network diagram you see our starting point is a typical SBS 2003 setup with two network adapters, one for the Lan and one for the Internet connection. We need to change that, after we uninstalled ISA Server 2004, to a single Nic setup. In the single Nic setup the SBS 2003 Server is connected to the same hub or switch where the router and the domain clients are connected. So to say, they live in the same subnet. Our goal is to configure the server with a 192.168.160.0/24 network. The new router is located at 192.168.160.2 and because of this we need to change the Server IP address to some IP address within that subnet. I choose 192.168.160.3 for the new SBS 2003 IP address. If that is done we can rerun the ICW and choose a ‘single’ Nic setup. We also need to reconfigure our DHCP scope so that is in our subnet. Pls, make sure that you disable the DHCP server on your router if it runs DHCP. If you do not disable that the DHCP server on the SBS 2003 will shutdown. 1. How to uninstall ISA Server 2004 from the SBS 2003 R2 Premium Server Uninstalling ISA Server 2004 from the SBS 2003 server is done from Add or Remove programs. From the Control Panel click Add or Remove Programs. In the list click Change/Remove for ISA Server. Click Next. Choose Remove and click Next. I choose to keep nothing, click Next Click Remove. Uninstall wizard is working. The Internet Connection Wizard starts, click Next Choose Broadband and click Next. A local router device with an IP address and click next. Make sure the option ‘My server a single Nic…’ is NOT checked. Click next. Click No. Choose the Network connection for your Internet Connection and click Next. In this stage there is not much we need to change. All IP addresses remain the same for now. Make sure you have chosen the correct Network Connections and choose Next Enable the Firewall and click Next. Make sure you have Virtual Private Network (VPN) unchecked. This is prerequisite for the migration we will do later to Windows Server 2012 R2 + Essentials. If VPN is enabled the migration will fail. Click Next Click Next Click Next. Click Next Click Next Next Click Next Review your settings and click finish. The wizard is working. Click Close Click Finish to close the ISA Server 2004 installation wizard. After this reboot the server if you were not prompted to do so. After the server is started pls check Internet Connectivity. 2. Change the SBS 2003 R2 to a single Nic setup Currently my setup runs on a Lan 192.168.16.0/24 for the first Network Adapter. The second network adapter is connected to a network 192.168.150.0/24 on IP address 192.168.150.150 with gateway 192.168.150.1 (router). Because we have bought a new router that has a default network running on 192.168.160.0/24 we have a lot to change. As you can see in the screenshot my Internet Connection Nic is manually configured with the values shown. Before I actually disable the network adapter I release those settings and set it to DHCP. Right click the Network Adapter that is currently connected to your router and choose properties. With Internet Protocol (TCP/IP) highlighted choose Properties. In both cases choose ‘Obtain automatically’ and click OK. Don’t worry if the adapter gets an IP address from your router if you had DHCP running. Right click the Internet adapter and choose disable. Verify that it is really disabled. Remove the old router and disconnect it from your network. Choose the network adapter that is connected to your switch, right click and choose Properties. With Internet Protocol (TCP/IP) highlighted choose Properties. In this screenshot we see the values as they were. We need to change those to the new situation and that is 192.168.160.3. Click OK. Click close. It can take awhile before settings are accepted. Remember that NO client will be able to connect to the server because it has been reconfigured to a new network. 3. Reconfigure DHCP scope settings The old scope still runs in the old subnet and because of this the ICW will fail to run. Before we can continue we need to make some changes in the scope settings of you DHCP server and after that we need to restart the DHCP server. Now we need to change the DHCP scope and restart the DHCP service. From the Start Menu start the DHCP console. The old scope runs in the old subnet. Easiest way is to delete the old scope. Right click and choose delete. If you have made special changes in the past it is a good idea to have a look in the scope options and make a note of those settings. Choose Yes to delete the scope. Right click the server and choose New Scope. Click Next. Choose a name and click Next Choose the Start and End IP address and click Next. We don’t make any exclusions for now, click next. We accept the default Lease Duration and click Next. Choose, Yes for configuring options. Click Next Choose to add the IP address of your router and click Next Fill in your local domain name and enter the new IP address of the server, click resolve and then add. Click Next. In the server name box type the name of your SBS 2003 server, click resolve and click add to add the servers IP address to the list of available WINS servers. Click next. Click Finish. You need to restart the DHCP server service and possibly you will need to authorize the server within your AD. 4. Run the Internet Connection Wizard and choose for a single Nic setup We are almost ready but one step must be made. We need to run the ICW once again and now we will make sure we check the option ‘My server uses a single network connection for local area network and internet traffic’. Rerun the ICW. Click Next Choose Broadband and click Next Choose a local router device with an IP address and click Next. Change the Local IP address of the router to the correct value. In my case it is 192.168.160.2 and I set My Server uses a single network… Click Next. Choose NO. Click Next Choose to create a new certificate. The old publishing certificate was only for use with ISA and cannot be used in the current situation. This will only be for the days you still use your SBS for email etcetra. Click Next. Next. Next Next Click Next Next Click Finish The wizard is working. Click close when done and reboot the server.