Am 11.12.2014 um 04:48 schrieb Warren Young: > I’ve held off reporting this since I thought it might just be some kind of fluke, but I’ve seen it now on three different boxes. > > The symptom is that the stock configuration of Apache only listens for IPv6 connections: > > $ netstat -na | grep :80.*LISTEN > tcp6 0 0 :::80 :::* LISTEN No, that's just the way it is displayed for apache. In fact the service listens on IPv4 as well (given we speak about the default configuration with `Listen 80'). Easy to verify. > You should see a second line there for IPv4, but you don't: > > tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN > > The stock httpd.conf file just says “Listen 80” which is documented as listening on both IPv4 and IPv6. [1] You’re supposed to need to go out of your way to get it to listen on just one or the other, but somehow CentOS 7’s Apache manages it. > > Since I only need IPv4, I’ve managed to hack it into working by changing that line in /etc/httpd/conf/httpd.conf to: > > Listen 0.0.0.0:80 > > Why do I need to do this? > > > > [1] https://httpd.apache.org/docs/2.4/mod/mpm_common.html#listen Alexander