Postalcode WMS Link Down

Hi there,

for short, i cannot import the WMS from this tutorial: https://wiki.openstreetmap.org/wiki/Import/Catalogue/Postleitzahlen_Deutschland_2010#Schritt_2:_Einen_Bereich_ausw.C3.A4hlen

The link: http://tools.geofabrik.de/osmi/view/plz/wxs?REQUEST=GetMap&SERVICE=wms&VERSION=1.1.1&FORMAT=image/png&SRS=EPSG:4326&STYLES=&LAYERS=plz_source,plz_osm&

In JOSM doesn´t work with parser error and copied in a browser there is an 500 internal server error. Is the link correct?
I try to help for editing postalcode data in germany? Its my first import, i tried all: “add” buttons in JOSM → WMS/TMS.

greetz