How do I fix Error 800 789 L2TP and setup VPN in Windows 7?

The client device lost the connection to its local network.
The user specified an invalid name or address for the VPN server.
A network firewall is blocking the VPN traffic.

If the server firewall restricts those ports, the VPN Virtual private network A virtual private network extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network. Applications running on a computing device, e.g. … en.wikipedia.org connection ends in 800 error. Usually, VPN uses the TCP port 1723 for PPTP Point-to-Point Tunneling Protocol The Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks. PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets. The PPTP specification does not describe encryption or authentication features and relies on the Point-to-Point Protocol being tunneled to implement security functionality. en.wikipedia.org and IP port 47. If the protocol is L2TP then the port is 1701.

Fix: Windows 7 error 800 (L2TP client over IPsec cannot connect) 1 “In Windows 7, go to VPN properties and click Security. Click “Advanced”. 3 Select Use Shared Key and Authentication, then click OK.

To prepare a Windows 8.1 PC to establish an l2tp VPN connection, owners must set up an L2TP connection in network settings. The exact selection may vary slightly depending on the type of control panel and existing configuration. On the Windows 8.1 start screen, check the entry field.

If the server’s firewall restricts certain ports, the VPN connection fails with seven hundred errors. Normally a VPN uses TCP, this port is 1723 for PPTP and IP port 47. If the protocol is definitely L2TP, the port has always been 1701. Therefore, we always make sure that the firewall does not restrict the following ports. 5. Router Firmware Similarly, changing a new VPN connection can result in VPN error 800.

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What is L2TP protocol and why use L2TP VPN?

L2TP or Layer 2 Tunneling Protocol is an extension of the PPP protocol that combines the best features of two additional tunneling protocols, PPTP and L2F, and is also used to support student virtual private networks (VPNs). Since L2TP itself, of course, does not provide privacy or strong authentication, it is often implemented using the ipsec protocol to establish a connection.