Required autocomplete reference field gives "ReadyState: 0" ajax error

I can't replicate this under Ubuntu 12.10 with Chrome and latest dev. Please provide more details (e.g. browser/OS versions)

Thanks.

I am getting the same error

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: http://mysite.com/taxonomy/autocomplete/field_tag
ResponseText:
ReadyState: 4

Works fine in Firefox.
Not working in Chrome.

Also, it doesn't work when creating the document. It works fine when editing a document.

I am getting the same error

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: http://mysite.com/taxonomy/autocomplete/field_tag
ResponseText:
ReadyState: 4

Works fine in Firefox.
Not working in Chrome.

Also, it doesn't work when creating the document. It works fine when editing a document.

Also, this began after I updated Drupal Core last week.

I'm also seeing the same problem on our Acquia hosting environment - live site, but not on test, dev, or my local.

I get the following error both when creating a node, and when editing a node.

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: https://www.example.com/entityreference/autocomplete/single/field_name/node/article/6066
StatusText: 
ResponseText: 
ReadyState: 4

I also get a similar error in the "Authored by" field on the node so this may not be related to references module:

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: https://www.example.com/user/autocomplete
StatusText: 
ResponseText: 
ReadyState: 4

My solution: The AJAX urls (see errors above) always started with https instead of http, but the pages I was on were http pages. This presented the problem. I checked settings.php and sure enough, the base_url started with https. Removing the S from base_url meant that AJAX did not try to prefix all its urls with https anymore, and so the error went away.

Not sure if this is the same problem others were having, but hopefully someone finds this hint useful.

I am using secure pages and removing node/add* and node/*/edit from the secure pages solved the issue

#5 sorted it for me

Curiously the error was happening with all users except user 1