FIX: VPN error 809 on Windows 10

Milan Stanojevic
by Milan Stanojevic
Windows & Software Expert
Milan has been enthusiastic about PCs ever since his childhood days, and this led him to take interest in all PC-related technologies. Before joining WindowsReport, he worked as a front-end web developer. Read more
Affiliate Disclosure
  • If you receive the VPN error 809, it means that the network connection between your computer and the VPN server could not be established because the remote server is not responding.
  • You can easily fix this error by following our instructions below. However, the best long-term solution is to use a native VPN app instead of a manual VPN connection.
  • Discover more solutions to similar issues in our VPN Errors Code section.
  • Join our VPN Troubleshooting Hub to master your VPN service.

VPN error 809 is usually caused by the firewall between the client and server, which blocks the ports used by the VPN tunnel.

On top of that, Windows doesn’t support IPsec NAT-T security associations to servers behind a NAT device by default.

When the error appears, the event log too won’t display any related logs because the traffic can’t reach the MX’s WAN interface. But you should be able to solve it on Windows 10.

Here’s the error message we’re talking about.

Windows 10 shows the VPN error code 809

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How can I fix VPN error 809 on Windows 10?

Enable the ports on your firewall or router

You need to open the ports on your firewall or router, depending on which VPN protocol you’re using.

  • Port 1723 over TCP for PPTP
  • Port 500 or 4500 over UDP for L2TP/IPsec or IKEv2/IPsec

If this is not possible, deploy the SSTP- or OpenVPN-based tunnel on your VPN provider.

This allows the VPN connection to work across the firewall, NAT, and web proxies.

Find out more about how to fix VPN blocked by Windows Firewall.

Use a VPN client instead of a manual VPN connection

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Windows 10 is prone to various problems, including VPN errors like 809. It can be the result of incorrect network settings.

Even if you manage to fix the issue, it doesn’t mean you won’t face it again.

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Make a small modification to the system registry

  1. Right-click Start and select Run
  2. Type regedit and press Enter
  3. Go to this location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent
  4. Open the Edit menu, go to New, and click DWORD (32-bit) Value
  5. Type AssumeUDPEncapsulationContextOnSendRule and press Enter
  6. Double-click the AssumeUDPEncapsulationContextOnSendRule entry
    • Set Base to Hexadecimal
    • Set Value data to 2
    • Click OK
  7. Restart your PC.

Note: some third party network apps can cause VPN error 809, like SmartByte, so disabling it can also fix the problem and let your VPN connect again.

Disable Xbox Live Networking services

  1. Type services in the search box
  2. Click on Services from search results
  3. Find Xbox Live Networking Services and disable it
  4. Check if your VPN connection works and if the error 809 disappears

If your anti-malware solution is not compatible with Windows 10, it could break down your IPsec connections.

So you should temporarily disable it to see if it’s the root of VPN error 809.

Discover more about how to bypass VPN blocks on Windows 10 PC.

Check PAP settings

  1. Click Start and select Settings
  2. Select Network and Internet
  3. Click VPN on the left pane
  4. Click Add a VPN connection and use the following:
    • For VPN provider, use Windows (built-in)
    • For Connection Name, write anything you like as this will be shown on the interface
    • For Server name or address, write the external hostname of your VPN
    • For VPN type, choose L2TP/IPsec
    • For Type of sign-in info, select Username and password
    • Click Save
  5. Select Change adapter options
  6. Right-click the connection you created and select Properties
  7. Under the Security tab, click Advanced Settings
  8. Click Use pre-shared key
  9. Enter the PSK and click OK
  10. Set Data encryption to Maximum Strength
  11. Under Authentication, select Allow these protocols
  12. Tick the PAP box only
  13. Restart your computer

In conclusion, you should be able to fix the VPN error 809 on your Windows 10 PC by opening ports in your firewall or router.

You can also make a tiny modification to your system registry and check PAP settings when creating the VPN connection.

However, the surest way to get rid of VPN errors is by using a native VPN app for Windows instead of setting up a manual VPN connection.

And we can’t think of a more suited VPN provider than Private Internet Access (buy here).

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