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.

Posts: 218
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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