>Hi,
>
>I need to log IP of the user who is using my ASP.NET application (access is anonymous). I found (by Googling) the call to Request.UserHostAddress as a way to get the IP. It works on my notebook where I see "127.0.0.1". How reliable this approach is when the user will be accessing the application on real Intranet or Internet?
>
>Thank you in advance for your help.

It works fine. The only "issue" is that if the people are behind a NAT firewall you will see the address of the firewall, not the user. For example, my IP address is 192.168.1.100 and I hit a website. The website will see the address of our firewall which is 12.*.*.* (not the 192.*.*.* address). All users behind that firewall will appear to come from the same addres. I say "issue" because some people mistake this for a problem when it's exactly the correct behavior.