On my SME I solved this as follows:
1. Open the server manager and navigate towards the "Hostname and adresses" panel.
2. You'll see a hostname "
www.yourdomain.com". As you can see the column "location" has a value "self" which means that the www site is on the server itself.
3. Click the "Modify" link and change the location to "Remote".
4. Click the "Next" button and provide the IP address of the (external) server where your website is hosted. The web site hosting company should be able to provide you with this information.
5. Click "Next", review the changes you've made and click "Add". The IP address you entered should now be listed in the column "IP address".
6. Open your browser and enter the URL "
www.yourdomain.com" and you will see the website on the external server. Perhaps a page refresh could be needed.
7. Make sure that you ask the internet service provider (or whoever holds the DNS records on his DNS server) to also change the IP address for the
www.yourdomain.com towards the same IP address as entered in step 4. If you don't do this you people outside the client's network will still be directed towards the site on the SME server. Take into account that changing a DNS record sometimes takes a few hours to actually work.
Hope this helps you out.
Frank