How to Fix Mullvad VPN on Windows
If Mullvad VPN is not connecting, disconnecting randomly, or failing to open on Windows, the issue is usually tied to network drivers, firewall rules, outdated software, or a corrupted installation.
This guide walks through the most effective fixes so you can restore a stable VPN connection without guessing.
Check the Basics First
Before changing advanced settings, confirm that the problem is specific to Mullvad and not your internet connection or Windows network stack.
A few quick checks can save time and point you toward the right fix.
- Restart your PC and try Mullvad again.
- Verify that your internet works without the VPN.
- Check whether Mullvad’s service or server status is affected.
- Try a different Mullvad server location.
If the VPN works on another network, the issue may be caused by your router, DNS configuration, or local firewall rules.
Update Mullvad VPN and Windows
Outdated software is one of the most common causes of VPN failures on Windows.
Mullvad regularly updates its app to maintain compatibility with Windows 10 and Windows 11, WireGuard, OpenVPN, and security patches from Microsoft.
- Open the Mullvad app and check for updates.
- Install the latest Windows updates from Settings > Windows Update.
- Restart the computer after updating both.
If the app was working before a recent update, the issue may also be caused by a temporary compatibility problem.
In that case, reinstalling the latest Mullvad version often helps.
Restart the Mullvad Service
Mullvad relies on background services to create and manage the VPN tunnel.
If those services stop responding, the app may open but fail to connect.
- Press Windows key + R, type services.msc, and press Enter.
- Find Mullvad-related services in the list.
- Right-click the service and choose Restart.
- If the service is not running, choose Start.
After restarting the service, reopen the Mullvad app and test the connection again.
Reinstall or Repair the Network Adapter
Mullvad uses virtual network adapters such as WireGuard and OpenVPN interfaces.
If these adapters are broken or missing, the app may not establish a tunnel correctly.
To repair the adapter, open Device Manager and look under Network adapters.
If you see a Mullvad, WireGuard, or TAP adapter with a warning icon, try these steps:
- Right-click the adapter and select Disable device, then Enable device.
- Uninstall the adapter and restart Windows so it can reinstall it.
- Reinstall Mullvad if the adapter does not return automatically.
For WireGuard-based connections, a damaged driver or adapter can prevent the tunnel from ever initializing.
Disable Conflicting VPN Software
Running multiple VPN clients on the same Windows machine can create driver conflicts, routing issues, and broken DNS settings.
This is especially common if you have previously used NordVPN, Proton VPN, ExpressVPN, Cisco AnyConnect, or a work-managed VPN client.
- Close all other VPN apps.
- Disable their auto-start options.
- Remove leftover virtual adapters if the software was uninstalled.
Also check for security suites that include their own VPN or web protection modules, since they may interfere with Mullvad’s tunnel setup.
Review Firewall and Antivirus Settings
Windows Defender Firewall, third-party antivirus tools, and endpoint security software can block Mullvad’s traffic or prevent the app from creating a secure tunnel.
This is common on managed PCs and systems with strict outbound filtering.
Temporarily disable your antivirus or firewall to test whether Mullvad connects.
If it works while protection is off, add Mullvad to the allow list rather than leaving security disabled.
Useful items to allow include:
- The Mullvad VPN application.
- WireGuard and OpenVPN related processes.
- UDP and TCP traffic on the ports used by your selected server.
If your device is managed by a company or school, local policy may override your changes.
In that case, contact the administrator.
Change the Tunnel Protocol
Mullvad supports different tunnel protocols, and switching between them can resolve connection failures caused by ISP filtering, network restrictions, or protocol-specific bugs.
- Try WireGuard first for speed and stability.
- Switch to OpenVPN if WireGuard fails.
- Test different transport modes if your network blocks standard VPN traffic.
Some public Wi-Fi networks, hotel networks, and office networks block UDP traffic or common VPN ports.
In those cases, a protocol change is often the fastest fix.
Reset DNS and Network Settings
DNS issues can make it seem like Mullvad is broken when the VPN is actually connected but websites will not load.
Windows network corruption can produce similar symptoms.
Open Command Prompt as an administrator and run the following commands one at a time:
- ipconfig /flushdns
- ipconfig /release
- ipconfig /renew
- netsh winsock reset
- netsh int ip reset
Restart Windows after running these commands.
This refreshes DNS cache, resets socket settings, and clears many common network-layer problems.
Check Mullvad DNS and Kill Switch Features
Privacy features can occasionally make a connection issue look worse than it is.
Mullvad’s kill switch, split tunneling choices, or custom DNS settings may prevent traffic from flowing when expected.
Review the app settings for:
- Custom DNS servers
- Kill switch or lockdown mode
- Split tunneling exclusions
- Auto-connect rules
If you changed these settings recently, reset them to default and test again.
This helps isolate whether the issue is caused by a specific configuration rather than the VPN itself.
Run the App as Administrator
Some network operations require elevated privileges on Windows.
If Mullvad does not have permission to modify adapters, routes, or firewall-related rules, it may fail silently or connect only partially.
Right-click the Mullvad app and select Run as administrator.
If that fixes the issue, set the app to always run with admin rights through its compatibility settings or shortcut properties.
Perform a Clean Reinstall
If nothing else works, the app installation itself may be corrupted.
A clean reinstall removes damaged files, stale drivers, and problematic configuration data.
- Uninstall Mullvad from Windows Settings or Control Panel.
- Restart the computer.
- Download the latest installer from Mullvad’s official website.
- Install the app again and sign in.
For stubborn cases, remove leftover network adapters during the uninstall process and restart before reinstalling.
When the Problem Is on the Network Side
Sometimes the issue is not your PC.
Internet service providers, router firmware, DNS resolvers, and captive portals can interfere with VPN traffic.
This is more likely if Mullvad works on mobile data but not on home Wi-Fi.
- Reboot the modem and router.
- Disable captive portal pages by fully signing in to the network first.
- Test Mullvad on a different network.
- Ask your ISP whether VPN traffic is being filtered.
If your router has built-in security or parental controls, check whether they block VPN ports or unknown encrypted traffic.
What to Try if Mullvad Still Will Not Connect
If you have already updated the app, restarted services, checked firewall rules, and tested multiple protocols, gather details before contacting support.
Specific error messages, server names, Windows version, and protocol choice help narrow the cause quickly.
- Note the exact error shown in the Mullvad app.
- Record whether the issue happens on all servers or only one.
- Test both Wi-Fi and Ethernet.
- Try a different Windows user profile if available.
Mullvad’s support team can usually help identify whether the issue is caused by a local system conflict, a network restriction, or a server-side condition.