- L2TP is a decent VPN protocol that provides a satisfactory level of encryption for your data.
- But sometimes, L2TP gets blocked for an unknown reason. Follow the steps below to allow L2TP connection on Windows Defender Firewall and solve this issue for good
- Check out more handy fixes in our VPN Errors and Solutions page.
- Go through our VPN Guides Hub as well for more useful information.
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.
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.
- In the Cortana search box, type Firewall, and then click on the Windows Firewall with Advanced Security
- In the new window, click on Inbound Rules.
- Click on New Rule.
- Select Port, and then click Next.
- Click on UDP and type in 50, 500, 4500 in the Specific local ports field, then click Next.
- Select the Allow the connection if it is secure option, and then click on Next.
- You can leave the next two windows for User and Computer blank, and click Next.
- Leave all the boxes in the next window checked, and click Next.
- Add a name for your new rule, and click Finish.
- 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 the trouble.
Please feel free to let us know if this solution helped you, by using the comment section below.
FAQ: Learn more about L2TP and VPNs
- How does l2tp VPN Work?
L2TP VPNs use tunneling technology to route your traffic data through secure VPN tunnels which are protected by encryption algorithms.
- What is the difference between PPTP and l2tp?
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.
- Which is faster PPTP or l2tp?
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.
Editor’s Note: This post was originally published in May 2019 and has been since revamped and updated in May 2020 for freshness, accuracy, and comprehensiveness.