That error message means that the problem is with your ISP. A DNS error usually means that your ISP's DNS servers might not have been updated, especially if you don't have fixed DNS servers you're using. What it means is that when you type in
www.ironworksforum.com, your ISP's server doesn't know what IP address to go to, so it comes up with a DNS error. Ring your ISP and complain because that shouldn't be happening.