Port 1701 UDP Issue

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Joined: Fri Feb 07, 2020 3:29 am

Port 1701 UDP Issue

Post by bealefay » Fri Feb 07, 2020 7:54 am

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?
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.
Last edited by bealefay on Mon Mar 16, 2020 9:45 am, edited 1 time in total.

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Joined: Wed Sep 18, 2013 1:49 pm

Re: Port 1701 UDP Issue

Post by centeredki69 » Fri Feb 07, 2020 8:51 pm

I have used SoftEther since 2012 with apple devices connecting with L2TP/IPsec to a windows hosted server. I also have a Ubuntu VPS running Softether Server with L2TP/IPsec as well for my apple devices. I have never had to open/ forward port 1701. I have only need to open/forward UDP ports 4500 & 500. Are you having issues connecting?
https://www.softether.org/4-docs/2-howt ... VPN_Server

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