Journalist
Tailscale not working with your VPN here’s how to fix it — quick, practical steps you can take to get back to a seamless, private networking experience. Quick fact: VPN and mesh VPNs like Tailscale can clash if both try to manage routes, DNS, or firewall rules on the same device. This guide breaks down the most common causes, how to verify them, and exact fixes you can apply today. If you’re pressed for time, jump straight to the fixes: check routing conflicts, adjust DNS, review firewall rules, and test with a clean profile.
- Quick tip: You’ll often solve issues by isolating variables. Start by undoing one change at a time and retesting.
- Pro tip: Keep a record of changes so you can rollback if something breaks.
If you want a fast, trusted option while you troubleshoot, consider a reputable VPN with easy split-tunnel support. For a complete privacy boost, you can explore NordVPN through this link: NordVPN. It’s a solid companion when you’re not sure which traffic should go through Tailscale or the VPN.
Introduction: Quick Summary Guide
Tailscale not working with your vpn here’s how to fix it: Start by understanding the two main problems—routing conflicts and DNS leaks—and then apply targeted fixes. Here’s a compact plan you can follow:
- Step 1: Confirm what’s broken connections failing, DNS resolution, or access to specific hosts.
- Step 2: Check system routes and Tailscale’s subnet routes vs. your VPN’s routes.
- Step 3: Adjust DNS settings to prevent name resolution leaks or misrouting.
- Step 4: Review firewall and security software that could block Tailscale or VPN traffic.
- Step 5: Test in safe mode or a clean user profile to rule out profile-specific issues.
- Step 6: If needed, reconfigure split tunneling or use a manual route to direct Tailscale traffic.
Useful resources unlinked text only:
Apple Website – apple.com
Wikipedia – en.wikipedia.org
Tailscale Documentation – tailscale.com
OpenVPN Community – openvpn.net
NordVPN Website – nordvpn.com
What We’ll Cover
- Why VPNs can interfere with Tailscale
- Step-by-step fixes for routing, DNS, and firewall conflicts
- How to test each fix with concrete commands
- Real-world scenarios and examples
- Frequently asked questions
Why VPNs Can Interfere With Tailscale
Tailscale builds a mesh network on top of your device, using WireGuard for point-to-point tunnels. Your VPN also sets up its own tunnels, routes, and DNS servers. When both are active, you can end up with:
- Conflicting routes that send traffic the wrong way
- DNS lookups resolving to the VPN’s DNS instead of your Tailscale endpoints
- Firewalls or security software blocking Tailscale’s WireGuard traffic
- Split-tunnel settings that exclude Tailscale from certain networks
Understanding these conflicts helps you pick the right fix. In practice, most problems fall into routing, DNS, or firewall categories.
Quick Win: Check Your Routing Tables
Misconfigured routes are the top reason Tailscale stops working when a VPN is enabled.
How to view routes on Windows
- Open Command Prompt as Administrator
- Run: route print
- Look for routes that involve 100.64.0.0/10 Tailscale’s default range or your VPN’s subnets
- If you see VPN subnets taking precedence over Tailscale routes, you may need to adjust priorities or use manual routes
How to view routes on macOS
- Open Terminal
- Run: netstat -rn or route -n get default
- Check for overlapping subnets between Tailscale and the VPN
How to view routes on Linux
- Open Terminal
- Run: ip route show
- Look for routes that mention 100.64.0.0/10 or VPN subnets
- If the VPN routes are more specific, you’ll want to add or adjust Tailscale routes
What to do if routes clash
- Use split tunneling to exclude VPN traffic from being forced through Tailscale, or
- Add explicit routes for Tailscale subnets so they take precedence
- In some VPN clients, there’s an option to “Disable VPN on LAN” or “Bypass VPN for local networks” which can help
DNS: Prevent Leaks And Misrouting
DNS misconfiguration is another common pitfall.
Symptoms
- You can reach Tailscale-hosted devices by IP but not by name
- DNS queries resolve to your VPN provider’s servers or fail entirely
- Private names don’t resolve inside the Tailscale network
How to configure DNS for Tailscale with a VPN
- Use Tailscale’s DNS settings to resolve names within your mesh
- Ensure VPN DNS doesn’t override Tailscale’s DNS or create circular resolution
- Consider using a local resolver or a dedicated public DNS that supports your setup
Quick tests
- nslookup
or dig @ - If queries fail or return VPN DNS, adjust the DNS configuration
Firewall And Security Software: Allow Tailscale And VPN Traffic
Firewalls can block the essential ports used by Tailscale UDP 41641 and other ephemeral ports depending on the system. Can a vpn really block those annoying pop ups and other privacy tips for browsing safely
Check firewall rules
- On Windows: Check Windows Defender Firewall with Advanced Security
- On macOS: System Preferences > Security & Privacy > Firewall
- On Linux: iptables or nftables rules
What to look for
- Rules that block UDP/UDP-CLI traffic to 100.64.0.0/10 or the specific Tailscale endpoints
- Rules that block outbound/inbound VPN traffic or split-tunnel traffic
- Security software that intercepts or filters VPN/Tailscale packets
How to fix
- Create explicit allow rules for Tailscale’s processes and ports
- If you’re using a third-party firewall, add exceptions for tailscale.exe, tailscaled, or the equivalent process on macOS/Linux
- Disable VPN-level firewall features temporarily to test
Software Conflicts: Other VPNs And Network Tools
Other software can interfere, including:
- Network monitoring tools
- Proxies
- Parental controls
- VPN client overlays
How to troubleshoot
- Temporarily disable other network tools
- Uninstall or disable conflicting software
- Reboot and re-check Tailscale after each change
Split Tunneling And Traffic Rules
Split tunneling defines which traffic goes through which tunnel. Misconfiguration here can route Tailscale traffic outside the intended path, or vice versa.
How to configure split tunneling
- For Windows or macOS, check VPN client settings for “Split Tunneling” or “Bypass VPN for local addresses”
- Exclude the Tailscale subnet from the VPN tunnel if necessary
- Alternatively, force Tailscale traffic through the VPN if required by your network policy this is more advanced
Practical example
- VPN: Subnet 10.0.0.0/8 routed through VPN
- Tailscale: 100.64.0.0/10
- Ensure both routes exist and that the system uses Tailscale’s route for 100.64.0.0/10, unless you have a reason to override it
Reinstall Or Reset Tailscale And VPN Clients
If the above steps don’t help, a clean reinstall can reset broken state.
Reinstall steps
- Uninstall both Tailscale and VPN client
- Restart your device
- Reinstall VPN client first, then Tailscale
- Log in and rejoin your tailnet
When to reset
- After major system updates
- After changing network adapters or VPN configurations
- If you’ve been toggling a lot of network settings
Advanced: Use Tailscale On-Device DNS With VPN Failover
For power users, you can configure Tailscale to run with a specific DNS resolver and enable failover to the VPN as a secondary resolver. This setup helps prevent DNS leaks and ensures you can still reach Tailscale devices when the primary resolver becomes unavailable.
Steps
- Enable magic DNS in Tailscale settings
- Point your DNS to Tailscale’s resolver or a trusted internal resolver
- Add a fallback DNS that the system will switch to if the primary fails
Real-World Scenarios And Quick Fixes
-
Scenario 1: You can connect to Tailscale but can’t access a specific host via its Tailscale IP. Airplay Not Working With VPN: Heres How to Fix It and If Its Even Possible
- Check routing for the host’s subnet and ensure that target subnet is not blocked by VPN routes
- Verify firewall allows traffic to that host
-
Scenario 2: DNS resolution for Tailscale hostnames fails when VPN is on
- Review DNS settings in your VPN app; ensure VPN isn’t forcing DNS through its servers
- Configure Tailscale DNS or use a shared DNS and test again
-
Scenario 3: VPN blocks all Tailscale traffic
- Adjust split tunneling to permit Tailscale traffic through the default route
- Ensure Tailscale’s UDP ports are allowed in firewall rules
-
Scenario 4: Your device loses connection to the Tailnet after a system update
- Reinstall Tailscale and reauthenticate
- Re-verify routes and DNS settings
Data And Metrics To Inform Your Fixes
- Tailscale relies on WireGuard, which typically uses UDP for performance and speed
- VPNs commonly use UDP or TCP, which can collide with Tailscale’s routing
- Common error codes: connection timeout, DNS lookup failed, host unreachable
- A majority of issues come from DNS misconfigurations and overly strict firewall rules
Triage Checklist: Quick Scan Before You Change Anything
- Is Tailscale connected at all? If yes, proceed to DNS and routing checks
- Are VPN routes overlapping with 100.64.0.0/10 or your chosen Tailnet subnets?
- Is DNS resolving Tailscale names correctly?
- Are firewall rules allowing Tailscale and VPN traffic?
- Have you tried a clean boot or safe mode to isolate issues?
- Have you tested with split tunneling or without to compare results?
Tables: Quick Comparison Of Settings
| Area | Common Issue | Quick Fix | Notes |
|---|---|---|---|
| Routing | VPN routes overshadow Tailnet routes | Adjust split tunneling; add explicit routes for 100.64.0.0/10 | Ensure precedence for Tailnet routes |
| DNS | DNS queries go to VPN resolver | Point DNS to Tailnet resolver or add fallback | Avoid DNS leaks |
| Firewall | Tailscale ports blocked | Create allow rules for tailscale/tailscaled | Check both system and antivirus firewalls |
| Split Tunneling | Traffic misrouted | Reconfigure to exclude Tailnet traffic from VPN or route Tailnet through VPN | Test after each change |
| Software Conflicts | Other network tools interfere | Disable or uninstall conflicting apps | Reboot after changes |
Step-by-Step Troubleshooting Playbook
- Confirm symptoms: Can you connect to Tailnet? Can you ping Tailnet devices by IP? Can you resolve their hostnames?
- Inspect routes: Identify which subnets are active and which are preferred
- Check DNS: Resolve a Tailnet host by name; test both with and without VPN
- Review firewall: Ensure ports for Tailscale and VPN are open
- Narrow down: Disable one variable at a time VPN, then Tailscale and test
- Reiterate: If a change helps, lock it in and document it
Best Practices For Long-Term Stability
- Use split tunneling thoughtfully; only route Tailnet traffic as needed
- Regularly review firewall rules after system or VPN updates
- Keep both Tailscale and VPN clients updated to latest versions
- Document your network setup for quick recovery after updates or if teammates use the same device
FAQ: Frequently Asked Questions
How do I know if Tailscale is blocked by my VPN?
If you can connect to Tailnet devices by IP but not by hostname, or if you see persistent connection timeouts, it’s often a DNS or routing issue caused by the VPN.
Can I use Tailscale and a VPN at the same time?
Yes, but you’ll need to configure routing and DNS carefully to avoid conflicts. Split tunneling and explicit route rules help a lot. Dedicated ip addresses what they are and why expressvpn doesnt offer them and what to do instead
What is 100.64.0.0/10 in Tailscale?
That’s the carrier-grade NAT range Tailscale uses for private addressing in the Tailnet when devices talk over the mesh.
How do I adjust split tunneling on Windows?
In your VPN client, look for Split Tunneling or Traffic Routing, and set Tailnet subnets to use the desired tunnel path.
How do I test DNS for Tailnet names?
Use nslookup or dig to query Tailnet hostnames and compare with VPN DNS behavior.
Why does switching VPNs sometimes fix Tailscale?
Different VPNs implement routing and DNS differently; one might have a configuration that clashes less with Tailnet’s routing.
Should I disable antivirus to fix this?
Only temporarily for testing. If antivirus blocks Tailscale, add explicit exceptions rather than leaving it disabled. Surfshark vpn blocking your internet connection heres how to fix it
How do I reset Tailscale on Windows/macOS/Linux?
Uninstall both Tailscale and VPN client, reboot, reinstall VPN first, then Tailscale, and reauthenticate.
What logs should I check?
Tailscale logs tailscaled and VPN client logs often reveal blocked ports, DNS failures, or route changes.
How can I ensure future updates don’t break this?
Keep a backup of your network settings, note your route and DNS configurations, and test after each major system or VPN update.
Sources:
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