The ports that Kamstrup wanted us to open for concentrator connectivity to the server are:
48190 and 5001
123 for NTP
161, 162, 10161, 10162 for SNMP
Similar to the Echelon NES server, it is very important that you should protect your Kamstrup server via a firewall to only allow certain IPs (the IP of your PNPSCADA server) to access your web ports (80, 443); otherwise people can basically read and switch your meters.