apache+XP+PHP page cannot be displayed

I am running the latest versions of apache with php as a module in windows xp. The problem I am running into is that when a php generated page gets above a certain size/certain amount of include, it will return a Page Cannot Be Displayed error if accessed from a non-local browser. Locally it will open fine, on the server computer and on a connected LAN computer. I do not have any firewalls installed, and all TCP/IP filtering is turned off. All I get in the access logs for people accessing it remotely is a 304 message for the page being the same as in cache... but when they try to access it it still gives the "Page Cannot Be Displayed" Any info?? Thanks, Chris