Bind
If your server has more than one (non lo) IP you will need to bind Noodle to one of them for the license key to work.
In the multiserver.conf look for lines like this:
Connection.CM_?.Port = ?
and add a line like this after each one:
Connection.CM_?.BindAddress = ?
example:
Connection.CM_0.Port = 80
Connection.CM_0.BindAddress = 192.168.1.100