Greetings!

Caching? DNS or page...

Perhaps...

Can you temporarily force your DNS servers to 127.0.0.1? This way, your DNS lookups will always fail. See if you can still get through / resolve those addresses, and to where. This will check to see if the DNS query is still occuring somewhere (will eventually come back with a lookup failure), you have something cached (immediate success) or a resolution (to your file contents) but failure.
_________________________
Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs