SCRIPT7002: XMLHttpRequest: Network Error 0x2ef3, Could not complete the operation due to error 00002ef3

This is the fix that worked for me. There is invalid mime or bad characterset being sent with your json data causing that errror. Add the charset like this to help it from getting confused:

$.ajax({
  url:url,
  type:"POST",
  data:data,
  contentType:"application/json; charset=utf-8",
  dataType:"json",
  success: function(){
  ...
  }
});

Reference:

Jquery - How to make $.post() use contentType=application/json?

Could not complete the operation due to error c00ce56e

We also encountered similar problems. However, setting the charset as noted in the previous comment did not help. Our application was making an AJAX request every 60 seconds and our webserver, nginx, was sending Keep-Alive timeout at 60 seconds.

We fixed the problem by setting the keep-alive timeout value to 75 seconds.

This is what we believe was happening:

1. IE makes an AJAX request every 60 seconds, setting Keep-Alive in the request.
2. At the same time, nginx knows that the Keep-Alive timeout value is ignored by IE, so it starts the TCP connection close process (in the case of FF/Chrome this is started by the client)
3. IE receives the close connection request for the previously sent request. Since this is not expected by IE, it throws an error and aborts.
4. nginx still seems to be responding to the request even though the connection is closed.

A Wireshark TCP dump would provide more clarity, our problem is fixed and we do not wish to spend more time on it.

I received the same error (SCRIPT7002: XMLHttpRequest: Network Error 0x80004004, Operation aborted), in our case it was because of JavaScript's same origin policy.

Our web app was making a JQuery AJAX call to our server on Port 8080. The call was getting intercepted and re-routed over SSL (due to server rules mandating that incoming traffic use SSL).

Once we made our web app load through the SSL port the issue was fixed.