Cannot connect Wordpress Server

Hi Guys;

My VPS has got CentOS release 6.7 (Final) and CWP version: 0.9.8.11.
I installed 2 WP web sites and 1 vBulletin web site. But I have a problem. Wordpress sites cannot connect WP servers. So I can't upgrade WP files and addons. I click UPDATES link in my admin page and I know new update available, but it says "there is no updates"...

Sorry my English. Do you know solution ? I tried to close firewall but it was not change anything.

My IpTablesRules is:
http://pastebin.com/index/S9MpT3M9

Contents of File: /etc/hosts.allow
http://pastebin.com/index/1BuRgQp4

Hi, check your log files /usr/local/apache/logs/error_log and try turn off you firewall ( csf -x ).