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This problem is specific to Linux / Ubuntu serves. The following solution assumes that your VPS was working great previously and you did not make any firewall / iptables changes to create this problem. This problem occurs when VPS server has a static IP address through netplan but over dhcp. You can verify this using the *.yml file under the /etc/netplan folder. You can fix this problem by making your VPS IP static in netplan, restarting your server, and reconfiguring iptables and firewalls. address that DHCP assigns dynamically. Even if DHCP assigns the same address, it can still make your VPS invisible to the outside world. Edit your *.yaml file and fill-out your VPS and server information as given below, save the file, and restart your server. # This is the network config written by ’subiquity’ network: ethernets: ens3: addresses: – /27 gateway4: nameservers: addresses: – – version: 2