Connect to Pritunl with a custom DNS server

Problem¶

I faced this issue when I disabled systemd-resolved on my system (Ubuntu 20.04) but Pritunl tried to update the DNS entry via systemd-resolvd and it failed when the service wasn't running.

sudo systemctl stop systemd-resolved         
sudo systemctl disable systemd-resolved

Logs where it tried to look for the service:

tail -f ~/.config/pritunl/profiles/*
<14>Mar 10 23:54:25 a65e97e8075b8b500c5e9cfe29083e4d-up.sh: Link 'tun0' coming up
<14>Mar 10 23:54:25 a65e97e8075b8b500c5e9cfe29083e4d-up.sh: Adding IPv4 DNS Server 1.1.1.1
<14>Mar 10 23:54:25 a65e97e8075b8b500c5e9cfe29083e4d-up.sh: SetLinkDNS(30 1 2 4 1 1 1 1)
Call failed: Unit dbus-org.freedesktop.resolve1.service not found.
<8>Mar 10 23:54:25 a65e97e8075b8b500c5e9cfe29083e4d-up.sh: 'busctl' exited with status 1
Wed Mar 10 23:54:25 2021 WARNING: Failed running command (--up/--down): external program exited with error status: 1
Wed Mar 10 23:54:25 2021 Exiting due to fatal error

You can see it fails at the step Call failed: Unit dbus-org.freedesktop.resolve1.service not found.

Solution¶

The solution is to disable systemd-resolved at the NetworkManager level. You need to add the following config block which overrides these settings at /etc/NetworkManager/NetworkManager.conf:

[main]
...
dns=default
systemd-resolved=false
...

Restart network-manager:

sudo systemctl restart NetworkManager

Now, when you try to connect to Pritunl, it will work fine :)