When you integrate Facebook into your website you will have to add Facebook script.  Usually you will add it to your head section. This will cause an error on IE6:

Internet Explorer Cannot Open the Internet Site - Operation Aborted

The nature of error is that it shows up when the page loads (or tries to load). The above image is what you see when the error occurs, if you click ok, you get a 404 Page cannot be found.

There are many scenarios that can cause this error which occurs on in IE. Microsoft has even issues a patch for solving  it.

For us, adding the defer=”defer” tag to the script quickly resolved the issue.

<script  defer=”defer”  bla bla></script>

Another  example of this error is when Google Map API code is being used.

Source: How to Fix Internet Explorer Cannot Open the Internet Site- Operation Aborted Error