We have an issue on a website, when the page redirect is configured we receive the "Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data." when the form is submitted.
The form in question is here - http://www.safarihotelsnamibia.com/safari-court-hotel/booking-form/
We can confirm that the entry is being captured regardless of the error, we've also checked wp-debug but no specific error regarding the issue is being logged.
PHP Version 5.3.10
MySQL Version 5.1.54
WordPress Version 3.4.1
Gravity Forms Version 188.8.131.52.4
Do you possibly have any insight as to what the issue might be?