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Softether Port 1701 UDP Issue

I have a Problem with my SoftEther Server: There is no way to tell the SoftEther server manager to listen on port 1701 (which is the L2TP/IPsec default port for Apple devices). According to the SoftEther documentation the port is supposed to be open by default – or is it?! But if I check with nmap the port is closed. I could theoretically add a TCP listener to this Port in the server config. However, since this is only TCP not UDP it wouldn’t work.
So: is there a way to tell SoftEther to listen to port 1701?

Did somebody have the same Problem?

My config:
Router with dyndns service and all ports forwarded.
Server running Debian with SoftEther.

The VPN connection with Windows10 is just running fine with no problems whatsoever.