Fix- ‘L2TP Connection Attempt Failed Because Security Layer Encountered A Processing Error’  

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Are you a frequent VPN user? If the answer is yes, then recently, you might have come across this error message the L2TP connection attempt failed because the security layer encountered a processing error”. Are you too looking for ways to solve this error then you have reached the right article? In this article, we will discuss the error, why it is occurring, and various solutions.

What Is A VPN?

A Virtual Private Network (VPN) is an encrypted connection that helps to protect anonymity and privacy over the internet. You can secure your network through a VPN connection, prevent data throttling, avoid bandwidth throttling, and achieve network scalability.

vpn
VPN

Check out: The Most Appropriate VPN Software Solutions for Software Developers

What Is An LT2P Connection?

Layer 2 Tunneling Protocol (LT2P) is a tunneling protocol used to support VPN and other private networks. It must rely on an encryption protocol to pass within the tunnel to ensure security and privacy.

What Are The Causes Of LT2P Connection Attempt Failure Error?

Listed below might be a few causes why you might be facing this error

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Corrupted Network Drivers

The network drivers installed on your computer might be corrupted.

corrupted network driver
corrupted network driver

Hence it might have triggered this error. You can reinstall the corrupted drivers and check if the error is fixed.

Microsoft CHAP V2 Protocols Disabled

In some instances, the error might occur because the Microsoft CHAP v2 protocol is disabled inside the VPN Connection’s properties.

chap v2 protocol disabled
CHAP v2 Protocols Disabled

So go ahead and enable the protocols and check if the error is fixed. 

 

What Are The Various Solutions To Solve The LT2P Connection Attempt Failure Error?

We have listed 5 methods in which you can fix your connection

Solution 1: Enable The Microsoft CHAP V2 Protocol

Follow the steps below to do so:

1. Simultaneously press the “Window + R” keys combination on your keyboard to open the “Run” window.

2. Once the box opens, type “ncpa. CPL” and hit the “Enter” key.

3. It opens the Network Adapter Settings. Now right-click on your VPN connection and select “Properties” from the menu.

4.     Click on the “Security” tab next and then click on the circle in front of the “Allow these protocols.”

5. Next, checkmark or enable the “Microsoft CHAP Version 2 (MS-CHAP v2)” box.

enable protocol
enable protocol

6. Now click on “Ok.” Now restart your computer or laptop and reconnect your VPN to check if the issue is resolved.

 

Solution 2: Enable LCP Protocol Extension

Follow the steps below to do so:

1. Simultaneously press the “Window + R” keys combination on your keyboard to open the “Run” window.

2. Once the box opens, type “ncpa. CPL” and hit the “Enter” key.

3. It opens the Network Adapter Settings. Now right-click on your VPN connection and select “Properties” from the menu.

4. Next, click on the “Options” tab and further click on “PPF Settings…”.

5. Now, checkmark the box in front of “Enable LCP Extensions” and then click on “Ok.”

enable lcp extension
enable LCP extension

6. Now restart your computer or laptop and reconnect your VPN to check if the issue is resolved.

 

Solution 3: Restart The IPSec Service

Follow the steps below to do so:

1. Simultaneously press the “Window + R” keys combination on your keyboard to open the “Run” window.

2. Once the box opens, type “services. MSC” and hit the “Enter” key.

3. It opens the Service manager. Now locate the “IKE and AuthIP IPsec Keying Modules” service and then right-click on it

4. Next select “Restart” from the menu. Then again, right-click on it and select “Properties.”

5. Click on the “General” tab and next click on the dropdown next to “Start-up type.”

start up type automatic
start up type automatic

6. Next select “Automatic” from the menu. Now save the changes made by clicking on the “Apply” button.

7. Now repeat the whole process for the “IPsec Policy Agent” service

ipsec policy agent
IPsec policy agent

Then restart your computer or laptop and reconnect your VPN to check if the issue is resolved.

 

Solution 4: Update Windows

Follow the steps below to do so:

1. Simultaneously press the “Window + I” keys combination on your keyboard to open “Settings.”

2. Now search for the “Update & Security” option and then click on it.

3. From the left-hand side column, select the “Windows Update” option.

4. Click on the Check for updates button. If there are any new updates available, then download them. It is advised to keep updating windows to avoid such issues.

windows updates
windows updates

5. Next, restart your computer or laptop and reconnect your VPN to check if the issue is resolved.

Solution 5: Reinstall The Network Drivers

Follow the steps below to do so:

1. Simultaneously press the “Window + X” keys combination on your keyboard and then go ahead and select “Device Manager” from the list of options.

2. Now scroll further down to “Network adapters.” Next, click on it to see its contents.

3. Next, right-click on your installed network drivers and then select “Uninstall driver” from the menu to uninstall them.

4. Now restart your computer or laptop and launch the device manager.

5. Next, click on the “Scan for hardware changes” button, which you can find at the top middle of the screen.

scan for hardware changes
scan for hardware changes

6. Now, a window will detect all missing drivers and then automatically install all those drivers on your computer or laptop.

7. Once done, check if the error is resolved.

See also: 7 Best VPN for Mac in 2021 (With Pros & Cons)

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  • Download this PC Repair Tool rated as "Excellent" on TrustPilot.com.
  • Click on Start Scan button to find errors related to Windows.
  • Click Repair All to fix all issues with Patented Technologies.

 Conclusion

We hope that the article was helpful and you were able to fix your VPN. Follow the website for more such articles. We hope you found the perfect fix for ‘ l2tp connection attempt failed because the security layer encountered a processing error ‘. 

 

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