Avast Antivirus Breaking Access to Unlocator
Avast Antivirus 2015 has introduced a new feature against DNS hijacking, which forces all DNS lookups trough Avast DNS servers. Ironically this is basically DNS hijacking and breaks access to the Unlocator DNS servers. In order to get around this problem you have to disable the Secure DNS feature in Avast. Please see http://www.avast.com/faq.php?article=AVKB89#idt_15