Connection Attempt Failed. Please Try Again Windows 10
Are you using a VPN (Virtual Private Network) to access certain websites? And so, you may come across an mistake "the L2TP connection effort failed because the security layer encountered a processing mistake" when you try to make a VPN connection. L2TP is a well-known connection used for encryption and protection of VPN. Some of the reasons why y'all may see this error are when the Microsoft CHAP v2 protocol is disabled or when the PPP settings are not configures properly. All the same, the good news is, the "the L2TP connection attempt failed because the security layer encountered a processing fault" issue can be resolved. Allow's see how.
Method ane: Uninstall latest security updates
Contempo Update may accept caused this consequence while breaking your VPN. for fixing this, you lot can uninstall your recent update.
1 – Search APPWIZ.CPL in Windows search box and click on it.
ii – Now, Uninstall most recent Microsoft Windows update by right clicking on the most recent Microsoft Windows update and then clicking on Uninstall.
kb:5009543 for Windows 10
kb:5009566 for Windows 11
three –Restart your computer
Method two: Turn on the Microsoft CHAP v2 Protocol
Step i: Right-click on Start menu and select Run to open the Run command window.
Footstep 2: In the Run control search box, type ncpa.cpl and striking Enter to open up the Network Connections window.
Footstep iii: In the Network Connections window, correct-click on your VPN connection and select Properties.
Step iv: In the VPN Properties dialogue box, go to the Security tab and select the radio button adjacent to Permit these protocols option.
Now, make sure that the box next to Microsoft CHAP Version ii (MS-CHAP v2)is checked.
Press OK to save changes and get out.
Now, attempt connecting to the VPN and you should not feel the "L2TP connexion attempt failed" mistake again.
Method 3: Turn on the LCP Protocol Extensions
Step ane: Printing the Win + R keys together on your keyboard to open the Run command box.
Step 2: At present, write ncpa.cpl in the Run command search field and press OK.
Step 3: In the Network Connections window that opens, locate the VPN, correct-click on it and select Properties.
Stride 4: This fourth dimension, become to the Options tab in the VPN Properties window and click on the PPP Settings button.
Step 5: Side by side, in the PPP Settings dialogue box, check the box adjacent to Enable LCP extensions.
Press OK to salve the changes and go out.
You can now attempt connecting the VPN and it should become connected without showing the error.
Method iv: By Restarting IPSec Service
Pace i: Press the Win + 10 hotkey on your keyboard and select Run to open the Run command.
Footstep 2: In the Run command window, type services.msc and hitting Enter.
Step 3:This volition open the Service manager window. Go to the right side of the Service manager and under the Proper name column, look for IKE and AuthIP IPSec Keying Modules.
If it shows running, right-click on it and select Restart.
Step 4: At present, double-click on information technology and in the Backdrop window, under the General tab, become to the Startup type department.
Prepare the field to Automatic.
Printing Apply and then OK to salve changes and exit.
Step 5: Repeat Steps 3 and four for IPSec Policy Agent service.
Now, restart your VPN connection and it should start working fine at present.
Method five: By Reinstalling the Network Adapter
Step i: Right-click on Commencement bill of fare and select Run. This will open the Run command window.
Stride 2: In the Run command box, type devmgmt.msc and striking Enter.
Step 3: In the Device Manager window that opens, navigate to Network adapters and aggrandize the section.
Locate the network adapter for your VPN, right-click on it and select Uninstall device.
Step 4: In the prompt that appears, click on the Uninstall button to ostend the action.
In one case uninstalled, restart your PC. The device gets reinstalled automatically and gets reset to its default settings.
Yous must also check that proper certificate is being used for both the client and the server. Brand certain that PSK (Pre Shared Cardinal) if used, is the same and is configured for both the client and the VPN server.
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Source: https://thegeekpage.com/the-l2tp-connection-attempt-failed-because-the-security-layer-encountered-a-processing-error/
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