Thanks to you both, but I'm not there yet - I read an article Tom referred to in an earlier post which said that each site should have a unique combination of IP, host name and port number. However, if I keep the same IP address (the IP of the server it resides on) and the same port number (80, 443)) and add a new hostname (WSUS), then add the hostname to the DNS, the WSUS site name says 'stopped' after it. If I try to start it it says 'IIS was unable to start this site. Another site may be already using the port you configured for this site". So I went back and altered the ports to 81, 444 and it started OK. But I still can't access the site -I'm not sure what I should be typing, but http://server2/wsus gives 'page cannot be found', http://wsus says 'IE cannot display the program'. Any further suggestions? Do I need to alter the IP as well? I'm only offered the fixed IP of the server or 'all unassigned' -can I add another one manually?