Couldn't access CentOS httpd

Question

I have been using Ubuntu, just recently started to work on Centos (CentOS Linux release 7.1.1503 (Core)) running in VMplayer on my desktop (Ubuntu).

Branch new CentOS installation.
installed httpd (using "yum")

for some reason, httpd didn't start automatically, I ran "service httpd start" and it started according to "netstat -antp".

[root@localhost ~]# netstat -antp Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1161/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1620/master tcp 0 0 10.0.0.19:22 10.0.0.7:20383 ESTABLISHED 2421/sshd: root@pts tcp6 0 0 :::80 :::* LISTEN 2453/httpd tcp6 0 0 :::22 :::* LISTEN 1161/sshd tcp6 0 0 ::1:25 :::* LISTEN 1620/master

I can access the http server locally (curl http://localhost within the CentOs command line)
when I tried access httpd from the host curl http://172.16.13.143/, it refused the TCP connection. I was able to to ssh into it, it works ok for ssh ssh [email protected].
I have stopped iptables service iptables stop
SELinux is turned off according to getenforce command.

I just need to do a quick test on the web interface but I can't. Really need some help. Thanks.

you're listening to port 80 via ipv6 only. there is no http server on ipv4 — Marc B
– Marc B, Commented Jul 30, 2015 at 20:58
I saw this too, not sure why. I don't have IPv6 configured on my network, why IPv6 but not IPv4. Do you know how to get out of this? thanks. — packetie
– packetie, Commented Jul 30, 2015 at 21:01
@MarcB, I don't think that's necessarily the case. That can indicate a socket listening on both IPv4 and IPv6. I just confirmed this on my system...netstat output looks the same, and I only use IPv4 on my network and my webserver is working :) — larsks
– larsks, Commented Jul 30, 2015 at 21:01
larsks: nope. if it was listening to ipv4, there'd be a :80 with proto tcp. — Marc B
– Marc B, Commented Jul 30, 2015 at 21:02

larsks · Accepted Answer · 2015-07-30 21:13:25Z

Packages installed on RHEL/CentOS/Fedora systems aren't supposed to start any services automatically (because maybe you're not ready to expose your service to the world until after you've configured it).

Running service httpd start will start the service temporarily, but it won't start next time you boot. You want systemctl enable httpd to enable the service to start automatically when you boot your system.

You could check if the firewall is actually disabled. Run iptables -S to see the current ruleset. The default iptables configuration typically allows only ssh and nothing else.

Update

Your system is probably running firewalld to manage the firewall. Try service firewalld stop.

You can run systemctl disable firewalld to prevent it from starting next time your system boots.

if it wasn't running, then why is there httpd on :::80, then?
Thanks @larsks for the answer. I enabled the service now (so next time I reboot the guest OS, httpd will be on automatically). I got a long list of entries in iptables -S. How do I disable iptables? I don't need any protection since it's development box. Tried service iptables stop but didn't work (can't establish a TCP connection to httpd from my desktop).
See my update. Your system is probably using "firewalld" to manage the local firewall.

Khorem · Accepted Answer · 2018-03-28 16:01:36Z

-- CentOS 7

add the following to '/etc/httpd/conf/httpd.conf'

Replace: Listen 80 With: Listen 0.0.0.0:80

this will disable ipv6 and enable ipv4

To check this type:

netstat -an | grep -i tcp | grep -i listen

restart apache service

systemctl restart httpd.service

Also, enable firewall to access port 80

firewall-cmd --permanent --add-service=http firewall-cmd --reload

Tushar · Accepted Answer · 2016-10-25 06:36:41Z

Did you do a iptables -L to make sure no firewall is running?

Execute following command to make sure no other firewalls is running too

ps -ef

"80" is being listened so something is blocking your connection looks like

sepehr hakimi · Accepted Answer · 2021-02-11 11:51:38Z

In a standard installation, CentOS 7 is set to prevent traffic to Apache.

add the ports to your firewall:

for http:

sudo firewall-cmd --permanent --add-port=80/tcp

for https:

sudo firewall-cmd --permanent --add-port=443/tcp

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