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Tailscale not working with your vpn heres how to fix it — quick guide, practical steps, and solid tips to get you back online fast. Quick fact: VPN conflicts with Tailscale usually boil down to routing, DNS, or firewall settings. This guide walks you through a step-by-step troubleshooting process, includes real-world examples, and gives you actionable fixes you can apply today.
- If you’re ready to dive in, you’ll find practical steps, checklists, and quick-win fixes below.
- Bonus resources and helpful links are listed at the end for deeper dives.
Introduction: Quick fact and what you’ll learn
Tailscale not working with your vpn here’s how to fix it — the main culprits are IP routing conflicts, DNS leakage, and blocked UDP traffic. In this guide you’ll discover:
- How to identify whether the problem is DNS, routing, or firewall related
- Step-by-step fixes you can apply on Windows, macOS, Linux, and mobile
- How to adjust your VPN and Tailscale settings to play nicely together
- How to test after each change to confirm things are working
Useful resources text only, not clickable:
- Tailscale Documentation – tailscale.com/docs
- VPN Troubleshooting Guide – vpnmentor.com
- How VPNs Work – en.wikipedia.org/wiki/Virtual_private_network
- Router and Firewall Settings Basics – support.google.com
- Operating System Networking Guide – support.microsoft.com
- Tailscale Community Forum – community.tailscale.com
What is causing Tailscale to not work with your VPN?
Key causes you’ll want to check first:
- Routing conflicts: When your VPN changes the default route, Tailscale’s peer-to-peer connections can get steered wrong.
- DNS resolution issues: If your VPN changes DNS or pushes its own DNS server, Tailscale nodes may fail to resolve subnets or services.
- UDP blocking: Tailscale relies on UDP typically 3478 and other ephemeral ports for NAT traversal; some VPNs or firewalls block UDP.
- Double NAT: If your network path involves multiple NATs, Tailscale’s mesh networking can struggle.
- Split tunneling misconfig: If VPN is set to only tunnel some apps, Tailscale traffic might not route as expected.
Quick checklists: symptoms and quick fixes
- Symptom: You can connect to the Tailscale network but can’t reach devices
- Fix: Check that allowed subnets and ACLs permit the devices you’re trying to reach; enable IP routing on the host if needed.
- Symptom: DNS lookups fail for Tailscale hostnames e.g., tailnet.local
- Fix: Ensure DNS settings pass through or use a reliable DNS server; consider disabling VPN DNS override temporarily.
- Symptom: VPN app blocks Tailscale traffic
- Fix: Adjust firewall rules to allow UDP/TCP traffic for Tailscale; add exceptions for inbound/outbound connections.
- Symptom: Intermittent connectivity
- Fix: Disable IPv6 temporarily if your VPN mishandles IPv6; ensure matching MTU across the tunnel.
Step-by-step: how to fix Tailscale not working with your VPN
Step 1: Confirm your environment and gather data
- Capture your OS, VPN client, Tailscale version, and network architecture
- Run: tailscale status –json to see current peer state
- Ping between devices on the tailnet to verify connectivity
- Check if VPN is forcing a single default route 0.0.0.0/0 or splitting traffic
Step 2: Temporarily disconnect conflicting VPN features
- Disable features that could cause routing conflicts:
- Disable VPN’s default route or “kill-switch” behavior that routes all traffic through VPN
- Toggle off “block non-VPN traffic” if present
- Turn off IPv6 on VPN adapters if IPv6 is not properly supported
- After disabling, try to connect to Tailscale and reach a remote tailnet device
- If it works, the issue is routing/IP policy related
Step 3: Adjust Tailscale subnet routes and ACLs
- Verify that the tailnet’s ACLs allow the devices you’re trying to reach
- If using subnets, ensure routes are advertised properly
- In tailscale admin console, re-check ACLs and, if necessary, temporarily relax restrictions to test
Step 4: Resolve DNS conflicts
- Check the DNS server configuration used by both your OS and VPN
- If your VPN pushes a DNS server, try setting DNS to 1.1.1.1 or 9.9.9.9 on the client temporarily
- Ensure that tailnet hostnames resolve correctly e.g., device1.tailnet
Step 5: Verify UDP traffic and firewall settings
- Ensure UDP ports used by Tailscale are allowed through both OS firewall and VPN firewall
- Common ports: 41641? depends on network traversal but Tailscale often uses UDP
- Add explicit allow rules for tailscaled and Tailscale UI processes
Step 6: Address NAT and MTU issues
- Check MTU on VPN tunnel; reduce MTU if suspected fragmentation
- If Double NAT, consider enabling NAT traversal settings or using a more direct path if possible
- On some networks, enabling “peer-to-peer traversal” or “NAT traversal” helps
Step 7: Reinstall or update components
- Update Tailscale to the latest version on all devices
- Ensure your VPN app is current and compatible with your OS
- If problems persist, reinstall tailscaled on Linux or the Tailscale app on desktop/mobile
Step 8: Advanced: manual routing adjustments
- On Windows, you can adjust route add commands to direct Tailscale traffic through the correct interface
- On macOS/Linux, check ip route and ip r commands to identify the correct gateway for tailnet traffic
- Avoid persistent misrouting by testing with temporary routes before making them permanent
Step 9: Test across devices and networks
- Test from multiple devices PC, phone, tablet connected to VPN and non-VPN
- Compare results with and without VPN active to isolate the issue
- Use traceroute/tracert to identify where traffic is dropping
Step 10: When all else fails
- Reach out to Tailscale support with a detailed snapshot:
- OS+version, VPN client, VPN server location, exact tailscale status
- Screenshots of routing table and DNS configuration
- Consider temporarily disabling VPN in a controlled test to confirm Tailscale’s baseline behavior
Tables: common fixes by symptom
- Symptom: No tailnet reachability
- Likely cause: Routing or ACL misconfiguration
- Fix: Review ACLs, enable necessary routes, check for 0.0.0.0/0 routing rules
- Symptom: DNS resolution failures
- Likely cause: VPN DNS override
- Fix: Set a reliable DNS on both device and VPN, test with external DNS
- Symptom: VPN blocks UDP
- Likely cause: Firewall or VPN setting
- Fix: Allow UDP ports for tailscaled, adjust firewall
Checklist you can reuse
- Confirm Tailscale is up-to-date on all devices
- Disable VPN default route temporarily to test
- Check and adjust DNS settings
- Ensure UDP traffic is allowed
- Validate ACLs and route advertisement
- Test with and without VPN
- Inspect MTU and IPv6 settings
- Reboot devices after major config changes
Practical tips from real-world usage
- If you’re on Windows and VPN changes DNS, set DNS to a stable resolver in network adapter settings.
- On macOS, try toggling “Block All Incoming Connections” in Security & Privacy as a quick sanity check.
- For Linux servers, confirm that tailscaled is allowed by the system’s firewall ufw, firewalld and that IP forwarding is enabled.
- Some corporate VPNs aggressively monitor traffic; in those cases, using a split-tunnel approach VPN for specific apps, Tailnet for others can be a practical workaround.
User-tested troubleshooting flow condensed
- Step 1: Turn off VPN defaults no /0 route, no kill-switch
- Step 2: Verify tailscale connectivity tailscale status, ping between nodes
- Step 3: Check DNS resolve devices.tailnet, try public DNS
- Step 4: Verify firewall rules allow tailscaled ports
- Step 5: Re-enable VPN with careful routing prefer split tunneling
Real-world scenario examples
- Example A: A developer in a home office, using a consumer VPN that overrides DNS and blocks UDP. Solution: Disable VPN DNS, set local resolver to 1.1.1.1, and whitelist tailscaled UDP ports in the firewall.
- Example B: An IT admin in a company network with a VPN that forces all traffic through VPN. Solution: Enable split tunneling for Tailscale, adjust ACLs to allow tailnet devices, and ensure UDP traversal is allowed.
- Example C: A student on campus Wi-Fi with dynamic IP and NAT. Solution: Use NAT traversal options in Tailscale, ensure tailnet routes are advertised, and verify no double NAT on the route.
Key takeaways
- The most common root causes are routing conflicts, DNS override, and UDP-blocking by VPNs
- Start with a controlled test: disable VPN defaults, confirm tailscale works, then reintroduce VPN settings gradually
- Always check ACLs and routes in the Tailnet; misconfigurations there are a frequent source of issues
- Keep both Tailscale and VPN clients updated to avoid known compatibility issues
FAQ Section
Frequently Asked Questions
Why is Tailscale not working when my VPN is on?
Because many VPNs alter routing, DNS, and firewall settings, which can conflict with Tailscale’s mesh networking. You’ll often need to adjust routing, disable conflicting DNS pushes, or allow UDP/Tailscale traffic through the firewall.
How do I fix DNS conflicts with Tailscale and VPN?
Set a reliable DNS server on the client, or configure the VPN to pass DNS requests through to a known resolver. Avoid VPN DNS overrides that block or misroute tailnet hostnames.
Can I run Tailscale while my VPN is connected on mobile?
Yes, but you may need to enable split tunneling on the VPN app so Tailnet traffic doesn’t have to go through the VPN path for every request.
What ports does Tailscale use, and should I open them?
Tailscale primarily relies on UDP for NAT traversal and peer connectivity. Ensure UDP traffic is allowed by your firewall and VPN.
How do I verify if the issue is routing or DNS?
Test reachability between tailnet devices by IP and by hostname. If IP works but hostname doesn’t resolve, it’s DNS. If neither works, it’s routing or ACLs. Airplay Not Working With VPN Heres How To Fix It And If Its Even Possible: A Complete Guide For 2026
Is double NAT a problem for Tailscale?
Yes, double NAT can cause connectivity issues. If possible, simplify the network path or adjust NAT traversal settings in Tailscale.
Should I disable IPv6 to fix issues?
Sometimes yes if your VPN doesn’t properly handle IPv6. Try disabling IPv6 temporarily to see if it resolves the problem.
How do I reset Tailscale to default settings?
You can reset by signing out and back in, or reinstalling the Tailscale client on the device. Be sure to reapply any ACLs as needed.
Can I use Tailscale with corporate VPNs?
Often yes, but corporate VPNs tend to be strict. Use split tunneling where allowed and ensure tailscaled is whitelisted in the firewall.
Where can I get official help?
Tailscale support through tailscale.com, and community forums at community.tailscale.com. Also consult your VPN provider’s support if they have specific guides for VPN-Tailscale interactions. Dedicated ip addresses what they are and why expressvpn doesnt offer them and what to do instead
End of post
Sources:
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