Can't connect to Proxmox web GUI

miser

New Member
Feb 9, 2023
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Hi there, I'm new to Proxmox and really excited to try it out. I installed Proxmox on a machine connected to my router but I can't connect to it from my desktop computer. I'm a beginner with networking so please could someone more knowledgeable give me advice.

In my router I configured the DHCP server to reserve the Proxmox machine with the IP address 192.168.1.1 and I used that IP during the installation process with CIDR /24. According to my router, the machine was allocated the IP 192.168.1.1.

In my router I set the LAN subnet mask to 255.255.0.0, the idea being that my physical devices can use 192.168.0.0/24 and my Proxmox machines and VMs can use 192.168.1.0/24.

With this setup, I expected that my physical devices could communicate with the Proxmox server and VMs, but I can't access the web GUI from my desktop machine at 192.168.0.10.

If I physically log into the Proxmox machine and run curl -k https://192.168.1.1:8006 | grep title, I can see that the GUI is responsive. If I run the same command from my desktop machine I get a connection timeout.

It's a fresh install so there should be no firewall settings in place. I can't ping the machine either. However, using nmap -sn 192.168.0.0/16 I can see it reports that the host is up:
Code:
Nmap scan report for 192.168.1.1
Host is up (0.00023s latency).

I investigated using traceroute which seemed to show no problems:
Code:
traceroute to 192.168.1.1 (192.168.1.1), 30 hops max, 60 byte packets
 1  192.168.1.1 (192.168.1.1)  0.843 ms  0.835 ms  0.821 ms

So it seems not to be a routing issue, yet I can't connect, and there are no firewalls.

Do I need to configure something like static routing? Or a VLAN?

If someone could give me advice I'd really appreciate it. Thank you.
 
Last edited:
I figured it out!

The CIDR asked for in the installation isn't the CIDR I want to use for VMs, but the CIDR for the subnet mask of the network.

To fix it I logged in as root and edited the address in /etc/network/interfaces from 192.168.1.1/24 to 192.168.1.1/16.