Solved: Tailscale Login Button Doesn't Open Browser

If you’ve ever clicked the Tailscale login button and nothing happens—no browser popup, no error message—you’re not alone. I recently encountered this issue myself and found a fix after much frustration. This post outlines what worked for me and compiles useful solutions shared by others facing the same problem.

The Problem

You click the Tailscale login button expecting a browser window to open so you can authenticate, but nothing happens.

No error. No popup. No progress.

In my case, the root cause was a restrictive office firewall (FortiGate). When I moved the machine to a network with a less strict policy, the login worked immediately—the browser popup appeared as expected.

What Worked for Me

Issue: Tailscale wouldn’t open the login browser window.

Cause: Restrictive office firewall (FortiGate).

Fix: Switched the machine to a non-restrictive policy or different network → browser login prompt appeared and everything worked.

Other Fixes That Helped the Community

1. Try a Different Network

“I was behind a corporate firewall preventing me from logging in.” — Redditor

If you’re on a corporate network or VPN, try switching to a home network or mobile hotspot. Sometimes DNS or VPN filtering blocks Tailscale’s requests.

2. Check Network Adapter Priority (Windows)

If you have multiple network adapters, Tailscale might not know which one to use.

Fix (Windows):

  1. Press Win + R, type ncpa.cpl, and hit Enter.
  2. Right-click your main network card → Properties.
  3. Select Internet Protocol Version 4 (TCP/IPv4) → Properties → Advanced.
  4. Uncheck "Automatic metric" and set the interface metric to 10.
  5. Save and restart Tailscale.

“Once I adjusted the metric, the login page popped up and authentication worked.” — cannotdisplay.com

3. Ensure a Default Browser Is Set

“I had no default browser set in Windows. Once I set Chrome as default, Tailscale opened the login link.” — Redditor

Check your Default apps settings in Windows and assign a browser like Chrome, Firefox, or Edge.

4. Turn Off Other VPNs

“I had a work VPN and a personal VPN running. Shutting both down and keeping only Tailscale running fixed the issue.” — Redditor

Right-click and exit all other VPNs from the system tray before trying again.

5. Blocked DNS Requests

“My work Wi-Fi was blocking VPN traffic by intercepting DNS requests.” — Redditor

This might not be easily fixable without switching networks or using DNS-over-HTTPS options, but it's something to be aware of.

6. CLI Login Hangs Too?

If tailscale up --authkey <key> hangs, it's likely the same root issue. Network card priority or DNS blocking may be at play.

7. Still Stuck? Generate a Bug Report

If none of the above helps, try this:

tailscale bugreport

Send the generated code to [email protected] along with a description or link to your troubleshooting steps.

Final Thoughts

There’s no single cause for the Tailscale login issue—network configuration, VPN conflicts, and OS settings can all play a role. In my case, the firewall policy was silently blocking the process. A network change resolved it instantly.

If you’re stuck, try the steps above methodically. Hopefully, one of them works as a “miracle fix” for you too.

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