antirez/redis — pull request #1696 by edgarsi (2014-04-21 18:59:39+00:00)
Title: Default unixsocketperm changed from 755 to 700, to be less confusing.

According to manuals "Connecting to the socket object requires
read/write permission."
http://man7.org/linux/man-pages/man7/unix.7.html

Permissions 0755 are confusing.