# 2 Configuration

In order to enable maintenance mode, file conf/maintenance.conf.php must
be modified to uncomment the following lines:

    // Maintenance mode
    define('ZBX_DENY_GUI_ACCESS',1);

    // IP range, who allowed to connect to FrontEnd
    $ZBX_GUI_ACCESS_IP_RANGE = array('127.0.0.1');

    // MSG showed on Warning screen!
    $_REQUEST['warning_msg'] = 'Zabbix is under maintenance.';

|Parameter|Details|
|---------|-------|
|**ZBX\_DENY\_GUI\_ACCESS**|Enable maintenance mode:<br>1 – maintenance mode is enabled, disabled otherwise|
|**ZBX\_GUI\_ACCESS\_IP\_RANGE**|Connections from these IP addresses will be allowed with no maintenance mode.<br>For example:<br>192.168.1.1-255|
|**warning\_msg**|Informative message.|