Network · medium

How to fix IPv6 tunnel causes connectivity issues

Error code: IPV6-LEAK-TUNNEL

What this error means

Windows automatically creates a 6to4 or Teredo tunnel for IPv6, which causes the connection to slow down or fail.

Updated

Before you begin

Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.

Work through these checks

0 of 3 complete
01Disable IPv6 via network adapter interface
  1. Disable IPv6 via network adapter interface
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

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02Disable Teredo tunneling: netsh interface teredo set state disabled
  1. Disable Teredo tunneling: netsh interface teredo set state disabled
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
03Try disabling IPv6 globally via the registry
  1. Try disabling IPv6 globally via the registry
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors

Possible causes

  • ISP does not support IPv6, but Windows automatically activates it
  • Conflict between VPN and IPv6 address