how to set notifications default server ip or hostname

For notifications the email received comes with an url pointing to localhost
upon click event on Point it redirects to http://127.0.0.1/?eventId=53521

how to set or where to change the $webUrl

email notification received

Device: Device2
Moving
Time: Thu May 11 11:11:23 CEST 2017
Point: 11.158071666666666°, 76.94424°

code for alarm notification

#set($subject = "$device.name: alarm!")
<!DOCTYPE html>
<html>
<body>
Device: $device.name<br>
Alarm:  $position.getString("alarm")<br>
Time: $event.serverTime<br>
Point: <a href="<strong>$webUrl</strong>?eventId=$event.id">#{if}($position.address)$position.ad$
</body>
</html>

You can set "web.url" parameter in the config file.