Page not displayed on some sites IE6.0

Useing DSL line and IE 6.0 and windows me when I try to go to for example http://www.away.com I get a page can not be displayed but I can go to many other sites and have been able to go here in the past.
I have deleted temporary Internet files and cookies and did a fix on IE 6.0 and tried everything with no results?
I get newsletters from away team and when I select the link to change my register info I still get a page can not be displayed and if I use netscape I get site refused connection?
same in Opera web browser.
I used to go here what could be wrong?