IE10/11 Ajax XHR error - SCRIPT7002: XMLHttpRequest: Network Error 0x2ef3

Question

I\'ve been working on this problem for a few days and reaching out on this forum since I feel like I\'ve exhausted my options. I have a form hosted on a Drupal 7 website an

Answer 1

I was seeing this error randomly with IE 8+9+10+11 Ajax calls. All other browsers did not have the problem.

It suppose there was a race-condition between KeepAlive connections. I am using Apache 2.4.7.

With the Apache 2 default settings in /etc/apache2/apache2.conf I was able to reproduce the error about every tenth Ajax call:

KeepAlive On
KeepAliveTimeout 5

Solution: Either setting

KeepAlive off

or

KeepAliveTimeout 1

solved the problem for me. I recommend anyone experiencing the 0x2ef3-Network error to fist set KeepAlive off on the server. If the error is gone, switch it on again and test with the values of KeepAliveTimeout. They can also be set to ms.

There is also a way to disable KeepAlive only for Internet Explorer.