I’ve been working on an xPages project lately, doing a lot of previewing in the browser. Today, when I came back to the project, I discovered that my ability to preview had disappeared. In one browser (IE7) I was getting a 404 error. In others I was getting nothing - a blank page. The reason why, it turns out, is that over the weekend I had changed my Skype settings so that Skype would start when Windows starts. But it seems that Skype grabs port 80 for some reason. The result: nhttp.exe won’t start. Solution: reset Skype for a manual start, then shut it down to release port 80.
It took me awhile to run this solution down, and I couldn’t find any reference to this problem on the Internet. So I just thought I’d share, in hope of saving the next victim some time.