The dashboard claims that the Zabbix Server is not running which is wrong.

1. fsockopen returns FALSE on error so please compare with FALSE in config.inc.php:
$status["zabbix_server"] = ($checkport == FALSE) ? S_NO : S_YES;

2. in blocks.inc.php
$table->AddRow(array(S_ZABBIX_SERVER_IS_RUNNING,new CSpan($status['zabbix_server'], ($status['zabbix_server'] == S_YES ? 'on' : 'off')),' - '));

So it is "on" if Status is S_YES, not "off".

So far this only fixes the color of the Zabbix Server Status, but the text is still "no" for unknown reasons.

ZABBIX server is running No -