Danny Willems -- Work In Progress

A mathematician fighting for privacy and security on the Internet, while dreaming about describing the Universe with equations and symbols. Cryptography researcher and engineer. Founder of BaDaaS. Building Papyrus and cryptography.academy. Co-founder of LeakIX.

ProtonVPN - DNS issue

April 24, 2023 | Danny Willems

You may encounter issues while using protonvpn on Ubuntu. I ended up multiple times without any way to reach servers. Pinging IP works, but not DNS resolution. It was related to a ProtonVPN issue.

When connecting to ProtonVPN, some connections are created.

nmcli connection show --active # to list all active connections
nmcli connection show # to list active and inactive connections

When you are not connected to a ProtonVPN server, there is still one active connection related to ipv6, pvpn-ipv6leak-protection.

Delete the connection:

nmcli connection delete pvpn-ipv6leak-protection

Should be fine now.

It is also causing issues while my laptop is suspended.