Image Added) and you operate the LANCOM Content Filter, applications such as WhatsApp stop working properly. This document describes how to implement a remedy for this.
Requirements: Procedure: In order to ensure that programs like WhatsApp continue to function where the LANCOM router firewall is operated with a deny-all strategy and the LANCOM Content Filter is operated at the same time, you need to configure explicit rules in the LANCOM firewall which allow the applications to communicate on other ports.
In the case of WhatsApp, these are the XMPP ports 5222 and 5223. 1) In LANconfig, open the configuration dialog for the LANCOM router and switch to the menu item Firewall/QoS |