If you can get into phpmyadmin, check the zpanel_core.x_settings table and make sure the IP is the correct one (row 21)
Also make sure that port 80 is open and forwarded to that server and there is an exception in the firewall for it.
Next, after the above is all checked and sorted, do a full daemon run: sudo /usr/bin/php -q /etc/zpanel/panel/bin/daemon.php
Restart apache: Ubuntu: service apache2 restart - CentOS: service httpd restart
Try to connect again.
Code:
21 server_ip Server IP Address xxx.xxx.xxx.xxx
Also make sure that port 80 is open and forwarded to that server and there is an exception in the firewall for it.
Next, after the above is all checked and sorted, do a full daemon run: sudo /usr/bin/php -q /etc/zpanel/panel/bin/daemon.php
Restart apache: Ubuntu: service apache2 restart - CentOS: service httpd restart
Try to connect again.