L2TP over IPsec connection failure via internet
Posted: Mon Jan 06, 2020 10:14 am
Hopefully this is a common issue with a simple solution. I have SoftEther Server operating on a Windows 7 PC. I can connect to this VPN via a Windows 10 computer (using the Windows VPN client) on the same LAN, just for testing using local IP, but no connection is possible via the internet.
I do have a router configured with port forwarding for ports 500, 4500, and also 1701, 1194 just in case. L2TP over IPsec is enabled in the SoftEther server, as well as OpenVPN.
The Windows Firewall for SoftEther is set for all connections (Public, Private, Domain) but tried disabling the firewall completely with no luck.
I do have experience configuring port forwarding on this router and it works for other servers I have running.
Windows reports "Error 789: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote server."
What on earth could be going on, when it connects locally but not via the internet? Is there another port I need to forward?
Many thanks.
I do have a router configured with port forwarding for ports 500, 4500, and also 1701, 1194 just in case. L2TP over IPsec is enabled in the SoftEther server, as well as OpenVPN.
The Windows Firewall for SoftEther is set for all connections (Public, Private, Domain) but tried disabling the firewall completely with no luck.
I do have experience configuring port forwarding on this router and it works for other servers I have running.
Windows reports "Error 789: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote server."
What on earth could be going on, when it connects locally but not via the internet? Is there another port I need to forward?
Many thanks.