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Hello Mario,
there is a known issue with the packet acceleration feature in Fritz!Box 7530AX current firmware which interferes with vpn traffic in .
This problem is confirmed by vendor AVM. Just ask AVM support about packet acceleration feature.
Here is the original support answer from their support (in German, because its a German company):
Klicken Sie in der Benutzeroberfläche der FRITZ!Box links unten auf "Inhalt" und dann unten auf "FRITZ!Box Support".
Etwas weiter unten finden Sie unter Paketbeschleunigung die Option die "Paketbeschleunigung deaktivieren".
Wählen Sie dies aus und klicken Sie rechts auf die Schaltfläche "Einstellung übernehmen".
Wichtig: Diese Einstellung bleibt nur bis zum nächsten Neustart der FRITZ!Box aktiv!
Summary / translation: Disable the packet acceleration feature using the support menu of Fritz!Box firmware webinterface. This will not survive reboot of the box.
They also confirmed that they are working on a fixed firmware. Unfortunately, it's not released yet.
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