Here is an example of how you can reproduce this issue:
1. Install CentOS 7 in a VMWare Workstation/Player VM setting a static ip.
2. yum install wget and update
3. run the install command after downloading the install script, for reference this is what i used and got the error with: ./install.sh --install=lamp,php54,php55,php56,xcache,bind,pureftpd,exim,dovecot,awstats,ruby,rails,mongodb,tomcat,csf
3. Reboot the system
You should be unable to access the webuzo install page on :2004/install.php
To resolve: in shell type: systemctl stop firewalld
To fully fix the issue even on a reboot: systemctl disable firewalld