VPN extremly slow Windows 11

Abo Ashkhatoyan 86 Reputation points
2023-07-14T13:55:11.7533333+00:00

In recent times, several users within our company have reported experiencing significant issues after updating to Windows 11 with the L2TP VPN, resulting in an extremely slow connection and a black screen when attempting to use Remote Desktop Protocol (RDP). The last updated version is KB5027231. Are there any known issues or maybe can somebody advice how I can get the solution?

Windows Network
Windows Network
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.Network: A group of devices that communicate either wirelessly or via a physical connection.
657 questions
Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
8,307 questions

5 answers

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  1. Christoph K 45 Reputation points
    2023-08-23T07:13:07.7033333+00:00

    For me uninstalling the updates KB5025305 and KB5026372 didn't work out.

    The solution offered by Kamil fixed the problem:

    "Hi, go to services.msc -> Routing and remote access -> change "start type" to Automatic (Delayed start) and click "Start"

    Establish a LT2P connection. FIXED"

    9 people found this answer helpful.
  2. Amber Malooly 10 Reputation points
    2023-08-24T14:49:14.9266667+00:00

    The solution by Kamil fixes the problem, thank you kind sir!!

    2 people found this answer helpful.
    0 comments
  3. S.Sengupta 15,521 Reputation points MVP
    2023-07-15T00:34:35.3933333+00:00

    Verify that your internet connection is stable and providing adequate speeds without the VPN. Run a speed test to ensure you're getting the expected bandwidth from your ISP.

    Download and install the updated Network drivers to see if it improves the VPN speed.

    You can try switching to a different protocol like OpenVPN or IKEv2.

    Adjust MTU settings: Maximum Transmission Unit (MTU) is the size of data packets transmitted over the network. Incorrect MTU settings can affect VPN performance. You can try adjusting the MTU value for your network adapter. To do this:

    a. Press Win + X and select "Windows PowerShell (Admin)" to open an elevated PowerShell window.

    b. Enter the command netsh interface ipv4 show interfaces to list the available network interfaces and their indexes.

    c. Identify the interface index corresponding to your active network connection.

    d. Run the command netsh interface ipv4 set subinterface "INTERFACE INDEX" mtu=1400 store=persistent, replacing "INTERFACE INDEX" with the actual index number.

    e. Restart your computer and test the VPN speed again to see if it improves.

    Disable Windows Auto-Tuning: Windows has a feature called "Auto-Tuning" that can sometimes interfere with VPN connections and slow down speeds. You can try disabling it to see if it helps. Here's how:

    a. Open an elevated Command Prompt by pressing Win + X and selecting "Command Prompt (Admin)".

    b. Type the command netsh int tcp set global autotuninglevel=disabled and press Enter. c. Restart your computer and test the VPN speed.

    Contact your VPN service provider: If the issue persists,

    1 person found this answer helpful.
    0 comments
  4. Kenneth Gilliam 5 Reputation points
    2023-08-24T19:55:28.98+00:00

    Running in an AD managed domain environment on Windows 11 Pro and it did not allow for the Routing and Remote Access service to be started. KB5027231 was not available as an uninstall option in Windows updates.
    Here is what I found worked instead:

    • Uninstall KB5029351
    • Restart
      • KB5029263 will automatically install upon restart
    • Uninstall KB5029263
    • Restart
    1 person found this answer helpful.
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  5. Jeff Uson 25 Reputation points
    2023-10-17T20:39:50.3433333+00:00

    its happening again with the october updates

    1 person found this answer helpful.
    0 comments