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Troubleshooting & FAQ

My VM has no internet​

Work through these checks inside the VM:

CheckCommandExpected
Correct IP?ip a10.10.10.X/24 on the network interface
Gateway reachable?ping -c 3 10.10.10.1Replies
Internet reachable?ping -c 3 1.1.1.1Replies
DNS works?ping -c 3 debian.orgReplies

  • No IP / wrong IP: fix the network settings, see Creating a VM.

  • Gateway doesn't reply: check the VM's Hardware → Network Device uses bridge vmbr1. Also check no other VM uses the same IP.

  • Gateway works, internet doesn't: check NAT on the host:

    cd /root
    iptables -t nat -S POSTROUTING | grep 10.10.10
    sysctl net.ipv4.ip_forward

    You should see a MASQUERADE rule and net.ipv4.ip_forward = 1. If not, run ifreload -a from /etc/network or reboot the host.

  • IPs work, names don't: set DNS servers 1.1.1.1 / 8.8.8.8 inside the VM.

My port forward doesn't work​

  1. Is the service running in the VM? From the host:

    cd /root
    nc -zv 10.10.10.20 22

    If this fails, the problem is inside the VM (service stopped, or the VM's own firewall, e.g. ufw or Windows Firewall).

  2. Is the rule active?

    cd /root
    iptables -t nat -L PREROUTING -n -v --line-numbers

    If it's missing, check the post-up line in /etc/network/interfaces for typos, then run ifreload -a from /etc/network.

  3. Are you testing from outside? Test from a different network (e.g. a phone on mobile data). Some routers can't connect to their own forwarded ports.

  4. Is the Proxmox firewall enabled on the VM? If yes, allow the port in VM → Firewall.

  5. Using OPNsense? Host forwards and OPNsense forwards conflict. Use only one method.

I can't reach the Proxmox web interface​

  • Use https:// and port 8006: https://YOUR-PUBLIC-IP:8006
  • If you enabled the Proxmox firewall, check that your current IP is in the management IPSet.
  • If you changed vmbr0 or the host is unreachable entirely, open a support ticket. We can access your server via the out-of-band console.

The network GUI shows "Pending changes"​

Somebody edited the network in the GUI without applying. Click Revert unless you know exactly what changed. Never apply changes to vmbr0 without being sure.

FAQ​

Can I give a VM its own public IP?​

Yes, with additional IPs ordered from us. We route them to your server and provide setup instructions. Please don't configure public IPs yourself, see Network Rules.

Can I use IPv6?​

Contact support to request an IPv6 allocation for your server.

Can I run containers (LXC)?​

Yes. Use Create CT, select storage local-lvm, and on the Network tab select bridge vmbr1 with a static IP 10.10.10.X/24, gateway 10.10.10.1. Download container templates under local → CT Templates → Templates.

How do I send email from my VMs?​

Outbound email on port 25 from a shared IP often lands in spam. For reliable delivery, use an SMTP relay service (port 587) with your own domain and SPF/DKIM records.

Can I change the private network 10.10.10.0/24?​

You can, but it's rarely worth it. If you need a separate network, add another private bridge or an SDN network (see Automatic IPs with DHCP) instead.

How much space do my VMs have?​

Check local-lvm in the left tree. The system and ISOs use local, while VM disks use local-lvm. LVM-thin allocates space as it's written, so keep an eye on usage and don't overcommit beyond what the disk can hold.

Something else?​

Open a support ticket in the client area and include your server's hostname, the VM ID, and what you've already tried.

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