I have just intalled apache on a fresh CentOS 6.5 installation. I entered the ip address in the browser address bar, and it failed to connect. I then turned off iptables, and refeshed, and this time I could connect.<\/p>\n
So clearly iptables is blocking the http (port 80) traffic. So I looked at the iptables rules:<\/p>\n
\n# Firewall configuration written by system-config-firewall\n# Manual customization of this file is not recommended.\n*filter\n:INPUT ACCEPT [0:0]\n:FORWARD ACCEPT [0:0]\n:OUTPUT ACCEPT [0:0]\n-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT\n-A INPUT -p icmp -j ACCEPT\n-A INPUT -i lo -j ACCEPT\n-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT\n-A INPUT -j REJECT --reject-with icmp-host-prohibited\n-A FORWARD -j REJECT --reject-with icmp-host-prohibited\nCOMMIT\n\n<\/pre>\nIt seems confusing as there is a “accept all” rule. I typed this – it explains the devices as well where acept all is on the lo interface. So all eth connections are dropped.:<\/p>\n
\n# iptables -L -v\nChain INPUT (policy ACCEPT 0 packets, 0 bytes)\n pkts bytes target prot opt in out source destination \n 11 764 ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED \n 0 0 ACCEPT icmp -- any any anywhere anywhere \n 0 0 ACCEPT all -- lo any anywhere anywhere \n 0 0 ACCEPT tcp -- any any anywhere anywhere state NEW tcp dpt:ssh \n 0 0 REJECT all -- any any anywhere anywhere reject-with icmp-host-prohibited \n\nChain FORWARD (policy ACCEPT 0 packets, 0 bytes)\n pkts bytes target prot opt in out source destination \n 0 0 REJECT all -- any any anywhere anywhere reject-with icmp-host-prohibited \n\nChain OUTPUT (policy ACCEPT 6 packets, 824 bytes)\n pkts bytes target prot opt in out source destination \n\n<\/pre>\nEdit iptables to add the rule:<\/p>\n
\n\n# nano \/etc\/sysconfig\/iptables\n# Firewall configuration written by system-config-firewall\n# Manual customization of this file is not recommended.\n*filter\n:INPUT ACCEPT [0:0]\n:FORWARD ACCEPT [0:0]\n:OUTPUT ACCEPT [0:0]\n-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT\n-A INPUT -p icmp -j ACCEPT\n-A INPUT -i lo -j ACCEPT\n-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT\n-A INPUT -j REJECT --reject-with icmp-host-prohibited\n-A FORWARD -j REJECT --reject-with icmp-host-prohibited\n\n<\/pre>\nCopy the ssh port 22 line and add it right under it, then change the port to 80. This is what it should look like:<\/p>\n
\n# Firewall configuration written by system-config-firewall\n# Manual customization of this file is not recommended.\n*filter\n:INPUT ACCEPT [0:0]\n:FORWARD ACCEPT [0:0]\n:OUTPUT ACCEPT [0:0]\n-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT\n-A INPUT -p icmp -j ACCEPT\n-A INPUT -i lo -j ACCEPT\n-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT\n-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT\n-A INPUT -j REJECT --reject-with icmp-host-prohibited\n-A FORWARD -j REJECT --reject-with icmp-host-prohibited\n<\/pre>\nRestart iptables<\/p>\n
\n# service iptables save\nservice iptables restart\n<\/pre>\n","protected":false},"excerpt":{"rendered":"I have just intalled apache on a fresh CentOS 6.5 installation. I entered the ip address in the browser address bar, and it failed to connect. I then turned off iptables, and refeshed, and this time I could connect. So clearly iptables is blocking the http (port 80) traffic. So I looked at the iptables … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,52],"tags":[],"class_list":["post-1628","post","type-post","status-publish","format-standard","hentry","category-cloud","category-iptables"],"_links":{"self":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/comments?post=1628"}],"version-history":[{"count":0,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1628\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/media?parent=1628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/categories?post=1628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.qbytes.cloud\/index.php\/wp-json\/wp\/v2\/tags?post=1628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}