What is a DNS leak?
A DNS leak is when your DNS requests (the ones that turn website names into IP addresses) go through your Internet Service Provider instead of the encrypted VPN tunnel, bypassing the VPN's privacy protections.
Troubleshooting for Web Browsers
Google Chrome / Brave / Opera
Open Settings → Privacy and security → Security
Scroll to Use secure DNS
Turn it OFF
Microsoft Edge
Open Settings → Privacy, search, and services
Scroll to Security
Disable "Use secure DNS"
Mozilla Firefox
Open Settings → Privacy & Security
Scroll to Enable secure DNS using
Select Off
Troubleshooting for Operating Systems
Windows
Connect to MysteriumVPN
Open Command Prompt (Start → type cmd)
Run:
ipconfig /flushdns
Open Network Connections (search in Start menu)
Right-click your adapter (Wi-Fi or Ethernet) → Properties
Select Internet Protocol Version 4 (TCP/IPv4) → Properties
Click Advanced → DNS tab
Remove all entries or add 0.0.0.0 and move it to the top
Click OK → Close
After disconnecting VPN:
Go back and select Obtain DNS server address automatically
Flush cache again: ipconfig /flushdns
For IPv6 leaks:
In TCP/IPv6 settings → enter :: as Preferred DNS
or disable it entirely
macOS
Go to System Settings → Network
Select Wi-Fi or Ethernet → Advanced → DNS
Remove all DNS entries (use - button)
Click OK → Apply
Open Terminal and run:
sudo killall -HUP mDNSResponder
(Enter your password when prompted)