After the most recent ESET Internet Security update, I started receiving a popup and warning stating "The ESET LiveGrid servers cannot be reached. This could be due to an outage or a problem with your network connection. Allow access to ESET LiveGrid servers on firewall." I did the test at this help page, ESET detected the file. After a period of time, the LiveGrid message would go away. Eventually it comes back. This happen earlier this year after update but resolved itself.