No permission prompt appears
Review the client documentation and system settings instead of installing an unknown modified build.
TUN troubleshooting
TUN Mode Not Working in Clash Meta
Troubleshoot Clash Meta / Mihomo TUN mode when it will not enable, lacks permissions, conflicts with routes, or breaks connectivity.
Content reviewed: 2026-08-21
Who it is for
Users who cannot enable TUN mode, lack permissions, or lose connectivity after enabling it.
Before troubleshooting
- Confirm the normal system proxy works
- Record the OS, client, and error text
- Temporarily close other VPN or traffic-capture tools
Troubleshooting steps
- 1
Disable TUN and confirm the profile, nodes, and normal system proxy work first.
- 2
Check that the client supports TUN and grant the required administrator, network extension, or VPN permission.
- 3
Close conflicting VPNs, virtual adapters, filters, and duplicate clients.
- 4
Check routes, DNS, firewall rules, and logs; if connectivity breaks, return to the normal proxy mode before testing one change at a time.
Common issues
All apps lose connectivity
Disable TUN, confirm the base profile and DNS work, then inspect route, port, and VPN conflicts.
Next step
If the client itself also fails to start, read the startup troubleshooting guide.
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