On 12/11/2014 09:35 AM, Warren Young wrote:
Am 11.12.2014 um 04:48 schrieb Warren Young:
the stock configuration of Apache only listens for IPv6 connections:
As per RFC 3493 (Sections 3.7 and 5.3) an IPv6 socket will accept
connections from IPv4 hosts, which will be mapped into the IPv6 address
space.
We noticed this problem when web browsers would refuse to connect to the server. *Then* we discovered the netstat oddity, and *then* we found that changing the Listen line in httpd.conf fixed it.
That leaves me still wanting an explanation for what happened.
New guess: there’s a difference between the IPv4 and v6 firewalls, so that changing the Listen line caused Apache to avoid the problem on the v6 side.
I don't have a good guess, there. If the client was actually connecting
from an IPv4 address, then the IPv4 firewall rules should have applied.
At least, that's what my testing indicates.
What I can say for sure is that a CentOS 7 system will accept IPv4 http
connections if the IPv4 firewall allows that port, or if the firewall is
disabled. Whatever problem you faced was caused by post-install
configuration. Try making your standard changes incrementally and
testing as you go until you can locate the steps where the problem occurs.
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