Fix: L2TP VPN issues [blocked / not responding]

Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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.
Affiliate Disclosure
  • L2TP is a decent VPN protocol that provides a satisfactory level of encryption for your data.
  • Sometimes L2TP could get blocked for unknown reasons, and that means your VPN won't work.
  • Since having a non-functional VPN can be critical to your privacy, you must fix it as soon as possible.
  • Follow the steps below to fix L2TP connections and solve this issue for good.
fix cannot connect to L2TP VPN on Windows 10

In order to connect to the Internet through your VPN service, L2TP is one of the best solutions, but many users reported that L2TP was blocked for an unknown reason. This can be a big problem and completely prevent you from using your VPN.

This issue usually occurs because the L2TP protocol isn’t allowed to go through your firewall. To fix the problem, you need to add a new rule in Windows Defender Firewall and allow ports 50, 500, and 4500 to go through your firewall. After doing that, L2TP will be unblocked and the VPN will start working.

In this article, we will explore some of the best ways to deal with issues L2TP issues.

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How can I fix blocked L2TP protocol on my VPN?

Allow L2TP connection through your Firewall

Note: It is very important that you make sure you are connected to the Internet before starting to set up your VPN connection.

If this criterion is not met, Windows will show you an error message after a minute telling you that the server got no response after sending the data package, or that something is wrong with your modem.

  1. In the Cortana search box, type Firewall, and then click on the Windows Firewall with Advanced Securitywindows firewall l2tp vpn blocked
  2. In the new window, click on Inbound Rules.inbound rules l2tp vpn
  3. Click on New Rule.screen 1 sol 4 - l2tp vpn blocked
  4. Select Port, and then click Next.port inbound rule l2tp vpn blocked
  5. Click on UDP and type in 50, 500, 4500  in the Specific local ports field, then click Next.UDP new inbound rule l2tp vpn blocked
  6. Select the Allow the connection if it is secure option, and then click on Next.allow the connection if it is secure l2tp vpn blocked
  7. You can leave the next two windows for User and Computer blank, and click Next.
  8. Leave all the boxes in the next window checked, and click Next.profile window l2tp vpn blocked
  9. Add a name for your new rule, and click Finish.name new rule l2tp vpn blocked
  10. You are all done! This setup will allow you to avoid any issues with your VPN‘s L2TP connection getting blocked by your Windows Firewall.

Following the steps presented in this article will surely help you regain access to your L2TP VPN service by making sure none of your firewalls are causing trouble.

Please feel free to let us know if this solution helped you, by using the comment section below.


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Frequently Asked Questions

  • Allow L2TP connection through your Firewall

  • L2TP VPNs use tunneling technology to route your traffic data through secure VPN tunnels which are protected by encryption algorithms.

  • They are both tunneling protocols, however, L2TP is considered more secure than PPTP due to its stronger 256-bit keys encryption that basically ciphers your data twice for enhanced security. On the other hand, using an L2TP protocol with your VPN takes its toll on speed.

  • More modest in the security department, PPTP is indeed faster than L2TP and it can make a good choice for streaming or gaming purposes. The most commonly used tunneling protocol that is both fast and secure is currently OpenVPN.

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