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if other users can successfully connect the VPN gateway over L2TP + IPsec and only this particular W8 has the issue, then the W8's firewall settings against IPsec should be double checked.<br />
<br />
open Windows Firewall's MMC, check IPsec's advanced settings as demonstrated here.<br />
<br />
How To Fix Error 800+789 L2TP &amp;How to Setup VPN Connection on Windows 7<br />
<a href="https://www.youtube.com/watch?v=YCbxTVonZJc" rel="ugc">https://www.youtube.com/watch?v=YCbxTVonZJc</a>
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if other users can successfully connect the VPN gateway over L2TP + IPsec and only this particular W8 has the issue, then the W8's firewall settings against IPsec should be double checked.

open Windows Firewall's MMC, check IPsec's advanced settings as demonstrated here.

How To Fix Error 800+789 L2TP &How to Setup VPN Connection on Windows 7
https://www.youtube.com/watch?v=YCbxTVonZJc [https://www.youtube.com/watch?v=YCbxTVonZJc]

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<div class="content wysiwyg-content">
Hello,<br />
<br />
I have setup L2TP+IPSEC on an EdgeMAX PoE router. &nbsp;Using a Windows 8.1 laptop, I can successfully make a VPN connection when I am behind the firewall using the public IP address, however, when I attempt to make the connection outside, I get an error 789.<br />
<br />
Any ideas?<br />
<br />
Have a great day,<br />
<br />
Don
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Hello,

I have setup L2TP+IPSEC on an EdgeMAX PoE router.  Using a Windows 8.1 laptop, I can successfully make a VPN connection when I am behind the firewall using the public IP address, however, when I attempt to make the connection outside, I get an error 789.

Any ideas?

Have a great day,

Don

Error 789 L2TP+IPSEC VPN on Ubiquiti Router

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.

Internet Protocol Security

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.

Windows 8

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.