FIX: VPN ERROR 734 PPP LINK CONTROL PROTOCOL TERMINATED

The ‘PPP links Control Protocol Was Terminated‘ error typically occurs when users attempt to lớn connect to lớn an existing VPN network or when attempting to lớn establish a dial-up connection. This problem is known khổng lồ occur on both Windows 10 và Windows 11.

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‘PPP link protocol was terminated’ error on Windows

After we’ve investigated this particular issue thoroughly, we realized that there are actually several different causes why you might experience this error code occurring on Windows 10 or Windows 11:


Incorrect option settings – As it turns out, more often than not, this problem will occur due lớn wrong credentials being saved for your network. If this scenario is applicable, you can fix the issue by accessing the Network connections menu & forcing your OS to remember the current credentials before attempting khổng lồ connect lớn the VPN network once again.Microsoft CHAP Version is disabled in VPN settings – If you are experiencing this problem while attempting lớn connect to a previously configured VPN network, the first thing you should vị is ensure that the Microsoft CHAP version is enabled for this particular connection. If this protocol is disabled, go to the Security tab & enable Microsoft CHAP Version 2.Multi-link is enabled for single-link connection – This problem can also occur due to a flaw inside the PPP (Point khổng lồ Point) protocol. In order khổng lồ fix this problem, you need lớn access the Properties screen of the problematic connection & uncheck the option named “Negotiate multi-link for single-link connections”.Data encryption is set to optional – Another scenario that might cause this problem is a scenario in which the current connection is configured khổng lồ use options data encryption (which ends up confusing for every network protocol used). To fix this problem, you need khổng lồ modify the current Data encryption.Firewall interference – Keep in mind that both Windows Firewall and 3rd buổi tiệc ngọt firewalls are known to sometime interfere with VPN connections & in some cases even make the connection unusable. To chạy thử out and see if this theory is correct in your case, temporarily disable your Windows Firewall or disable/uninstall a 3rd các buổi tiệc nhỏ equivalent & see if the ‘PPP links Control Protocol Was Terminated’ error is now fixed.Improper dial-up connection – If you’re experiencing this problem while attempting to dial-up a PPP connection, there are some modifications you need lớn do. First, you need to lớn disable multi-link for single liên kết connections, then force the encryption on your connection.

Now that we went over every potential reason why you might experience this problem, let’s get khổng lồ the fixing part. Below you’ll find a các mục of verified fixes that will allow you to lớn pinpoint and resolve the ‘PPP liên kết Control Protocol Was Terminated‘ error.

1. Modify the Option Settings

As it turns out, the majority of the time, this problem is caused by incorrect network credentials being saved. If this is the case, you can resolve the problem by going to the Network connections menu & forcing your OS to lớn remember the current credentials before reconnecting lớn the VPN network.

Several affected users have confirmed that they manage lớn fix the problem by accessing the Network Connnections menu & forcing the VPN connection to lớn ‘forget the credentials’ before saving the changes & attempting lớn connect through it once again.

For step by step instructions on how to vì chưng this, follow the instructions below:

Press Windows key + R to xuất hiện up a Run dialog box.Next, type ‘ncpa.cpl’ inside the Run dialog box & press Ctrl + Shift + Enter to mở cửa up the Network Connections menu with admin access.Accessing the Network Connections menuWhen you’re prompted by the User Account Control (UAC), click Yes lớn grant admin access.Once you’re finally inside the Network Connections menu, right-click on your VPN network và then click on Properties from the context thực đơn that just appeared.
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Accessing the Properties screen of the VPN networkOnce you’re inside the Properties screen, use the ribbon menu at the đứng top to select Options.Inside the Options screen, uncheck the box associated with the Remember my credentials.Save the changes by clicking Ok, then you can safely close the Network Connections window.Attempt to connect khổng lồ the VPN section once again and see if the problem is now fixed.

If the same ‘PPP links Control Protocol Was Terminated’ error is still occurring, move down lớn the next method below.

2. Enable Microsoft CHAP Protocol in VPN Settings

If you are experiencing the ‘PPP links Control Protocol Was Terminated’ error while attempting to connect lớn a VPN network via the native functionality, you are not the only one.

On Windows 10 và Windows 11, this is the most common cause for this particular error:

Can’t connect to *VPN Network Name*The PP link protocl was terminated.

If you find yourself in the same scenario, you’ll be please to lớn know there’s an easy fix. You’ll need to lớn access the Network Connections menu và modify a few security options belonging khổng lồ your VPN connection – you can find these inside the Properties screen of your VPN.

Note: All you need to vì chưng is to allow a hidden protocol called Microsoft CHAP Version 2 (MS-CHAP v2).

For specific instructions on how to vì this, follow the steps below:

Press Windows key + R to xuất hiện up a Run dialog box.Next, type ‘ncpa.cpl’ inside the Run dialog box & press Ctrl + Shift + Enter to open up the Network Connections menu with admin access.Accessing the Network Connections menuWhen you’re prompted by the User Account Control (UAC), click Yes to grant admin access.Once you’re finally inside the Network Connections menu, right-click on your VPN network and then click on Properties from the context thực đơn that just appeared.Accessing the Properties screenOnce you’re inside the Properties screen, use the tab at the vị trí cao nhất to click on Security.Next, once you’re inside the Security tab, scroll down khổng lồ the bottom of the screen và select the Allow these protocols(under Authentication).Once the Allow these protocols toggle is selected, kiểm tra the box associated with Microsoft CHAP Version 2 (MS-CHAP V2).
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Enable the Microsoft CHAP Version 2Click OK to lớn save the changes, then restart your PC & attempt to lớn connect to the same VPN that was previously triggering the ‘PPP link Control Protocol Was Terminated‘ error.

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If this scenario was not applicable as you’re experiencing this error while attempting khổng lồ connect khổng lồ a dial-up connection, move down lớn the next method below.

3. Disable Multi-Link for Single-Link Connection

If you are experiencing this error while attempting to connect to a dial-up connection (for whatever reasons), you will most likely see Error 734. In this particular scenario, the problem is most likely occurring because Multi-link negotiation is turned on for a single-link connection.


Update: Another viable scenario that might cause the ‘PPP links Control Protocol Was Terminated‘ error while you try to connect lớn a dial-up connection is having the dial-up connection security configuration improperly configured or configured lớn require a secured password.

If one of the scenarios described above is applicable, follow the instructions below khổng lồ fix the problem:

Press Windows key + R to open up a Run dialog box.Next, type ‘ncpa.cpl’ inside the Run dialog box & press Ctrl + Shift + Enter to xuất hiện up the Network Connections thực đơn with admin access.Accessing the Network Connections menuWhen you’re prompted by the User Account Control (UAC), click Yes to grant admin access.Once you’re finally inside the Network Connections menu, right-click on your VPN network và then click on Properties from the context thực đơn that just appeared.Accessing the Properties screenOnce you’re inside the Properties window, click on the Options tab và click onPPP Settingsfrom the menu underneath.After you’re finally inside the PPP Settings panel. Go ahead and uncheck the box associated with “Negotiate multi-link for single-link connections”. Click Ok khổng lồ save the changes, then click on Ok once again khổng lồ save the changes.Finally, close the window và attempt khổng lồ connect to lớn the VPN connection once again.

If the problem is still occurring, move down khổng lồ the next method below.

4. Force Data Encryption

Another circumstance that could create this issue is if the current connection is configured khổng lồ employ data encryption options (which ends up confusing for every network protocol used). You must change the current Data encryption to resolve this issue.

Several affected users have confirmed that the ‘PPP liên kết Control Protocol Was Terminated‘ error was finally fixed after they modified the Properties screen of the VPN network & force it to lớn always requireencryption.

If you’re looking for specific instructions on how to vì chưng this, here’s what you need to lớn do:

Press Windows key + R to xuất hiện up a Run dialog box.Next, type ‘ncpa.cpl’ inside the Run dialog box và press Ctrl + Shift + Enter to open up the Network Connections menu with admin access.Accessing the Network Connections menuWhen you’re prompted by the User Account Control (UAC), click Yes to grant admin access.Once you’re finally inside the Network Connections menu, right-click on your VPN network and then click on Properties from the context thực đơn that just appeared.Accessing the Properties screenOnce you’re inside the Properties screen, click on the Security tab và look for the option named Data encryption.When you see it, modify the drop-down menu toRequire encryption (disconnect if server declines).Click Ok lớn save the changes, then reboot your computer.Repeat the kích hoạt that was previously triggering the ‘PPP links Control Protocol Was Terminated‘ error và see if the problem is now fixed.

If the problem is still not fixed, move down lớn the next method below.

5. Disable the active firewall

Keep in mind that both Windows Firewall và third-party firewalls have been known to interfere with VPN connections, making them ineffective in some situations.

To determine if this theory is right in your instance, briefly disable or uninstall your Windows Firewall, or a third-party equivalent, & see if the ‘PPP liên kết Control Protocol Was Terminated’ error has been resolved.

It’s possible that your firewall or antivirus software is interfering with your ability to lớn connect khổng lồ your game. The problem could be resolved by adding your trò chơi to the firewall’s trắng list. If not, get assistance from the firewall’s manufacturer.

Despite the fact that this problem is far more widespread with third-party antivirus software, we did locate a few user reports of it occurring with Windows Firewall.

If you’re in this predicament & think your firewall is lớn blame, you may rapidly test that theory by turning off any firewall functionality that’s currently running.

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Disabling the 3rd party firewall

If you’re using a third-party firewall, disable it for the time being before rebooting & reinstalling the failed Windows Update.

Note: Depending on the tool, the exact procedures for disabling your third-party firewall will differ. Consult the official documentation for detailed information on disabling your 3rd tiệc ngọt firewall’s real-time protection.

If you’re using Windows Firewall, however, follow the steps below to lớn temporarily disable Windows Firewall:

Press the Windows key + R to mở cửa the Run dialog box.Then type ‘ms-settings:windowsdefender’ into the text box and press Enter to open the Windows Defender Security Center window.
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Accessing the Windows DefenderSelect Yes to grant admin access if the User account Control (UAC) prompts you.Once you’re in the Windows Security panel, click Firewall & Network Protection in the left-hand pane.
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Accessing the Firewall và Network protection menuSelect the currently active network from the Firewall và Network Protection menu, then scroll down through the danh mục of settings to lớn disable the Windows Defender Firewall toggle.
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Disable the Windows Defender firewallOnce the firewall has been disabled, repeat the kích hoạt that was previously causing the ‘PPP links Control Protocol Was Terminated‘ error & see if the issue has been resolved.