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AmerllicA
Asked: 2020-05-12 09:49:17 +0800 CST

Connection issue after installing NordVPN on Lubuntu 20.04

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I'm using Lubuntu LXQt desktop version 20.04, and everything was ok until installing NordVPN. during the using NordVPN, I have no issue with the connection. but when the laptop is idle for some time and when I back to browser it seems there is no connection. so I test it with:

ping 4.2.2.4

And I get this error:

ping sendmsg operation not permitted

Even I use sudo or do login/logout, just restarting entire the system could help me to back to the working network. obviously there is another issue. so:

What is the problem and how I can fix it?

NordVPN outputs:

$ nordvpn status
    Status: Disconnected
$ nordvpn settings
    Technology: OpenVPN
    Protocol: UDP
    Kill Switch: disabled
    CyberSec: disabled
    Obfuscate: disabled
    Notify: enabled
    Auto-connect: disabled
    DNS: disabled
networking lubuntu network-manager openvpn

4 Answers

  1. Best Answer

    I realized that the Linux firewall block the NordVPN firewall and the NordVPN killswitch stop the connection, so I should stop the Linux firewall and re-run the NordVPN service and the connection will get back on track.

    By using the following command:

    sudo ufw enable && sudo ufw disable && sudo /usr/bin/systemctl restart nordvpnd
    • 1

  2. ok I think I have solved this for me.. the issue was that with 20.04 the editing of etc/resolv.conf with the nordvpn alternate DNS does not work, it reverts to defaults. so following these instructions here

    https://www.ricmedia.com/set-custom-dns-servers-on-ubuntu-18-or-20/#Set_DNS_servers_with_Netplan_Network_Manager_and_static_IP

    I edit my the file to edit is etc/netplan/*.yml in my case only one file there as 01-network-manager-all.yaml .bak

    now I have it set up as per above/below, and for some strange reason ubuntu is now helpfully putting my ethernet wired in as eth0 (I will try it on the other adapter later today). Ubuntu is however showing unmanaged in top right desktop wired status, but that is not affecting anything.

    # Let NetworkManager manage all devices on this system network:

     version: 2

 renderer: NetworkManager

 ethernets:

    eth0:

       dhcp4: false

       addresses: [192.168.1.114/24]

       gateway4: 192.168.1.1

       nameservers:

    save file and then

    sudo netplan --debug apply

    and it all now works, those alt dns addresses are from

    https://support.nordvpn.com/Connectivity/Troubleshooting/1088041672/Change-your-DNS-servers-on-Windows.htm

    I disconnect the ethernet adapter from usb hub, and reconnect it, I get the nordvpn notification popup that it has reconnected, it survives the dns leak test at http://dnsleak.net - which is why I was setting alt dns in the first place.

    • 0

  3. ok, with excellent support from nordvpn, there is a new client. I can now disconnect from vpn

    nordvpn disconnect

    , change the usb hub (ie disconnect from ethernet,), reconnect a different hub, then reconnect via terminal nordvpn. it works.

    sudo apt --purge autoremove nordvpn*

    cd ~/Downloads sudo wget 
"https://repo.nordvpn.com/deb/nordvpn/debian/pool/main/nordvpn-release_1.0.0_all.deb"
 sudo dpkg -i nordvpn-release_1.0.0_all.deb
 sudo apt update
 sudo apt upgrade
 sudo apt install nordvpn

    my nordvpn command is

    nordvpn connect usxxxx && nordvpn set killswitch on &&  nordvpn status && nordvpn settings

    where usxxx is your nominated server, you can get the best one from [https://nordvpn.com/servers/tools/][1]

    • 0

  4. This can happens sometimes if you disconnect from nordvpn but have not turn the killswitch off. To see if this is your problem:

    nordvpn set killswitch off
    • 0