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Fix VPN Connection Dropping Frequently

VPN clients disconnect sporadically from the server due to MTU mismatches, aggressive keepalive timeouts, or unstable underlying internet connections.

vpnconnection-dropmtuipsecopenvpn

Confirmed working on: Windows 10 · Windows 11

Before you begin

Match the environmentUse this guide only for Windows 10, Windows 11 or a clearly compatible setup.
Protect recoveryBack up important data and save encryption or account recovery keys before changing system state.
Know when to stopMake one change at a time and stop if the result differs from what the guide describes.

Problem overview

Your Virtual Private Network (VPN) connection drops randomly, forcing you to reconnect manually. This disrupts secure browsing, remote work sessions, and active downloads.

Common causes

  • Incorrect Maximum Transmission Unit (MTU) size causing packet loss
  • Aggressive network adapter power management settings
  • Transport protocol issues (UDP vs TCP)
  • Interference from local IPv6 configurations

Solution 1: Change the VPN protocol

  1. Open your VPN client software settings.
  2. Look for the Protocol or Connection tab.
  3. If the VPN is using UDP, switch it to TCP. TCP guarantees packet delivery and is often more stable on unreliable networks.
  4. Alternatively, if your client supports it, switch the protocol to WireGuard, which offers better resilience to network changes.
  5. Reconnect to the server and monitor for drops.

Solution 2: Adjust network adapter power settings

  1. Press Windows Key + X and select Device Manager.
  2. Expand the Network adapters section.
  3. Right-click your primary Wi-Fi or Ethernet adapter and select Properties.
  4. Go to the Power Management tab.
  5. Uncheck the box that says Allow the computer to turn off this device to save power.
  6. Click OK.
  7. If your VPN client installs a virtual adapter (e.g., TAP-Windows Adapter), repeat these steps for that adapter as well.
Expert Tip

Some laptops aggressively cut Wi-Fi power on battery mode. Ensure your Windows Power Plan is set to “Maximum Performance” for wireless networking.

Solution 3: Adjust the MTU size

  1. Open Command Prompt as administrator.
  2. Find your network interface names by running: 
    netsh interface ipv4 show subinterfaces
  3. Locate the name of your VPN interface (e.g., “Ethernet 2” or “Local Area Connection”).
  4. Lower the MTU to 1380 to prevent packet fragmentation over the tunnel. Run: 
    netsh interface ipv4 set subinterface "Interface Name" mtu=1380 store=persistent
  5. Reconnect your VPN.

Solution 4: Disable IPv6 on the adapter

  1. Press Windows Key + R, type ncpa.cpl, and press Enter.
  2. Right-click your active internet connection and select Properties.
  3. Scroll down the list of items and uncheck Internet Protocol Version 6 (TCP/IPv6).
  4. Click OK.
  5. Repeat this process for the VPN’s virtual network adapter.
  6. Restart your computer and test the VPN connection.
Critical

If your workplace enforces strict IT policies, disabling IPv6 or modifying MTU sizes might violate compliance checks. Always check with your IT department if using a corporate VPN.

Confirm the result

  1. Repeat the exact action that originally triggered the problem.
  2. Confirm the original error or symptom is gone and no new warning has appeared.
  3. If the guide changed a driver, service, package, or system setting, restart once and test again.
  4. If the result is worse or unexpected, stop. Reverse only the last change using its documented restore option; if none is documented, use your backup or qualified support.

Questions about this fix

Why does my VPN drop when my PC sleeps?

Windows often turns off network adapters to save power during sleep, which severs the active VPN tunnel.

Is WireGuard more stable than OpenVPN?

WireGuard handles network transitions (like switching from Wi-Fi to cellular) much more gracefully than OpenVPN.

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