Installed a vpn(Protonvpn) on my system.After i rebooted my pc I am unable to use my Interent i tried restarting the network manager .I am a noob ig its a firewall issue but i dont know how to fix that :(.Plz help
Solved D: It actually messed with /etc/resolv.conf i added the nameserver 8.8.8.8 to it and voila its working
Edit: There’s a problem in this thing when i edit the resolv.conf file it keeps the name servers 8.8.8.8 temporarily when i disconnect and connect the wifi again i start facing the problem of no internet again 
It probably introduced routes that messed up your Internet connection.
Do ip r and post the result.
This happened to me, had to turn the kill-switch on and back off for a permanent fix since resolv.conf resets on reboot
If you are using NetworkManager, it overrides /etc/resolv.conf every boot and possibly more frequently. What you need add is:
[global-dns-domain-*]
servers=<comma separated server list here>
Fun fact, you can configure custom DNS for different domains in this file.
This sort of shit is why I don’t trust VPN clients from VPN providers. Just use the OpenVPN package with credentials from your VPN provider. At least that way you know you are getting competent VPN software.
Disconnect from protonvpn.
$ protonvpn-cli d
Funny thing is it happened to me as well like 2 days ago. What worked for me was make protonvpn remake the proper routes and settings. I used their cli client to solve it : protonvpn disconnect. You should have the cli client installed, I am pretty sure it comes with the app when installing with the package manager.
Common issue with proton vpn. Sadly i don’t know how to solve it, I just know that this happens when you shutdown your system while you are connected to ProtonVpn. If you disconect and quit proton and then shutdown, It wont happen.
i had this happen once, but not only did it messed the dns, it also messed up with the time and the hardware’s time was not used as default. The automatically adjusted timing by the system was totally wrong, going 2 weeks backwards for me. I resolved it by using timeshift i had no idea why, but i decided to do a backup just before i used the vpn specifically proton. ProtonVPN and protonmail can break your linux installs, so use timeshift before you install something. But i heard this can be resolved by manually configuring your DNS, and then setting the software’s time to follow the motherboard’s hardware time. so yeah, you may have to try these 2 things out. Also back up your stuff if it is arch becuz arch breaky.
I had a similar issue with my VPN at work yesterday. Dns is managed in a different way now, creating some mess when you’re using a VPN client.
Don’t use Arch Linux if you’re a noob.
For me ProtonVPN wouldn’t work if nm-applet(network-manager-applet) wasn’t running.
Quite annoying, I’d turn off my PC without turning off the VPN, then after boot I didn’t have internet and couldn’t disconnect until I launched the applet.
Try disabling kill switch. My buddy literally had this problem 3 hours ago
Just had the same issue with FortiClient VPN after it hanged and I killed it by force. It had added some dns servers to my Network connection. So I removed them using the kde Network-> Connection-> IPv4 settings and restored them to 1.1.1.1,1.0.0.1 which I use.
You can also manually edit this information for your connection by editing the file for your connection under
`/etc/NetworkManager/system-connections/`
This will fix it for you.
The problem is if you restart without disabling the VPN first the leak protection doesn’t get disabled.
https://github.com/ProtonVPN/linux-app/issues/20#issuecomment-890363441
try “protonvpn-cli c -f” on the terminal
I had this exact issue. The vpn service is still running when rebooting which messes up your dhcp configuration file. Changing the file is only temporarily so you need to kill the service manually and then reboot.
What caused it was my desktop powered off forcibly while the vpn was connected so avoid doing that when connected. I also ditched the proton client and use it through openvpn instead.
is your PC system windows?
Are you downloading/uploading any kind of torrent ? Or are you with your torrent client open ?