Update vpn-troubleshooting.md

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## Tips ## Tips
* Check the VPN service's log in the VPN VM by running: * If using qubes-vpn, check the VPN service's log in the VPN VM by running:
~~~ ~~~
sudo journalctl -u qubes-vpn-handler sudo journalctl -u qubes-vpn-handler
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* Use `iptables -L -v` and `iptables -L -v -t nat` to check firewall rules. The latter shows the critical PR-QBS chain that enables DNS forwarding. * Use `iptables -L -v` and `iptables -L -v -t nat` to check firewall rules. The latter shows the critical PR-QBS chain that enables DNS forwarding.
## VPN does not reconnect after suspend ## VPN does not reconnect after suspend
After suspend/resume, your VPN may not automatically reconnect. In order to get it to work, you must kill your VPN system and restart it.
This applies when using OpenVPN.
After suspend/resume, OpenVPN may not automatically reconnect. In order to get it to work, you must kill the OpenVPN process and restart it.
## VPN stuck at "Ready to start link" ## VPN stuck at "Ready to start link"
After setting up your VPN system and restarting the VM, you may be repeatedly getting the popup "Ready to start link", but the VPN isn't connected. After setting up OpenVPN and restarting the VM, you may be repeatedly getting the popup "Ready to start link", but the VPN isn't connected.
To figure out the root of the problem, check the VPN logs in `/var/logs/syslog`. The log may reveal issues like missing libraries, which you can then install. To figure out the root of the problem, check the VPN logs in `/var/logs/syslog`. The log may reveal issues like missing OpenVPN libraries, which you can then install.