Not sure when this actually happened, I guess since Windows 8.1 was released. I have been using the MVPS Hosts File for years but today I just noticed this little paragraph update notice under the July-08-2014 update.
Important Note: The HOSTS file now contains a change in the prefix in the HOSTS entries to "0.0.0.0" instead of the usual "127.0.0.1".
This was done to resolve a slowdown issue that occurs with the change Microsoft made in the "TCP loopback interface" in Win8.1.
This change in the prefix should not affect users. I've had some feedback and COMODO antivirus, Homer Webserver and System Mechanic seems to have issues with the "0.0.0.0" prefix ... to resolve this issue:
You can use the "Replace" function in Notepad to convert the entries, or HostsMan (see below) has an option for converting the entries to "0.0.0.0".
If this proves to be a permanent fix ... I will update the website to reflect the changes.
... it still seems to be OK with XP ... just a "heads up" on this change since Windows 8.1 was released.
Edited by monroe, 15 July 2014 - 12:19 PM.