A user found out possible cause:

@jeremiah.foster some people still report the issue, even though they have the latest ca-certificates (both on amber and byzantium). Any way to troubleshoot this further?

@jeremiah.foster could you please explain how to update ca-certificates?

This was a hardware issue specific to a single unit.

Confirmed, the network-manager-openvpn 1.8.14-1~pureos1 fixes the issue! Thank you @jonas.smedegaard

@jonas.smedegaard Yes. I'll will have the latest version tested and report back, thanks!

I'm sorry, we don't support any hardware that requires proprietary firmware. Your best bet is to install and use Debian with non-free repo enabled.

This is unsupported hardware, you probably need proprietary firmware for nouveau driver...

This package version is found in Debian experimental: https://packages.debian.org/experimental/network-manager-openvpn

@sebastian.krzyszkowiak I am not aware, I could not find anything on their bug tracker. But this issue has been fixed with https://gitlab.gnome.org/GNOME/NetworkManager-openvpn/-/merge_requests/34 and it seems that version with the fix, v1.8.14, is released already.

openvpn: 2.5.1-1
network-manager-openvpn: 1.8.12-2

@jeremiah.foster We already reproduced the issue with Librem Tunnel.

Did you update system?

Arch Linux discussion: https://bbs.archlinux.org/viewtopic.php?id=260567

This is not a bug report. If you forgot your password that is not an OS' issue.

Thanks, corrected.