Why does IE8 render my site then immediately redirect to its internal 404?

Question

I administer a site, hosted on Yahoo! hosting, which has recently shown a strange behavior: when you visit in IE8, the page loads and is rendered normally, then as soon as it finishes rendering, the browser switches to show its local/internal 404 page. The address bar still shows the site URL.

When I view the site in (as far as I can tell) the same state on my local Apache server, it doesn't do this. This leads me to suspect it may have something to do with server configuration and response headers, but I don't know what that might be.

Is anyone familiar with this behavior?

Answer 1

I experienced this behavior when using a .htc hack to provide artificial CSS border-radius support.

Answer 2

I'm not sure what is causing that issue specifically, but you could use a packet capture utility like Wireshark or Fiddler2 to investigate the issue further. Otherwise, it would be helpful if you were to post a link to the site.