Eddy
2
It is not the domain that is blocked, but the IP.
The reason for it is that there are malicious websites hosted on the same IP.
http://zulu.zscaler.com/submission/show/8f714df721f3b28928eadb020794f22d-1391602583
http://urlquery.net/report.php?id=9236546
You can ask to unblock the url here : http://www.avast.com/contact-form.php