If a reverse proxy is used to connect to Planon, make sure to configure the RemoteIpValve for the Planon web server. For more information, see:https://tomcat.apache.org/tomcat-9.0-doc/api/org/apache/catalina/valves/RemoteIpValve.html

Planon has functionality that returns URLs for which this valve should be configured to return the correct URLs. The configuration of this valve is very specific to your reverse proxy setup and not to the Planon installation. We can only inform you that you must configure it, not what parameters are required.