Rails - Apr 2006 - Problems with AJAX and IE6

I have been using AJAX for a while in IE6 and Firefox without any problem.

A few days ago, some IE6 machines quit working and looking at the log,
the request never reaches the server. The weird part is that some
other IE6 machines work fine as well as Firefox.

The link is using form_remote_tag function.

Any ideas of what''s going on?

Thanks in advance,
Santiago