> For the complete documentation index, see [llms.txt](https://docs.defguard.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.defguard.net/support-1/troubleshooting-guides/desktop-client/resolvconf-not-found-debian.md).

# resolvconf not found (Debian)

On some Linux distributions, including Debian 12 and 13, the Defguard client may fail to establish a VPN tunnel after clicking Connect. The root cause is that the `resolvconf` command is not installed.

Install it with:

```sh
sudo apt install openresolv
```

Retry the connection after installation.