[SOLVED] Can't access Proxmox Web UI until after ping from PVE -> Client

[tt2468]

I'm having a weird issue and I've been unable to find a solution online, but I have a feeling someone here might know the solution.

I've got a PVE 7.1-7 box running right now, and I have its management interface assigned as `vlan10` (The main VLAN on my network). We'll call the hypervisor `PVE`, and the networked machine trying to access the web interface `Client`.

Problem: When the server has freshly started, Client can ping PVE, but Client cannot access the web interface of PVE due to `Connection Refused`. If PVE pings any LAN or Internet IP, the problem does not change. If PVE pings Client's IP, client can now magically access PVE's web interface indefinitely until reboot.

Here is my interfaces file:

auto lo
iface lo inet loopback

auto eno1
iface eno1 inet manual

auto eno50
iface eno50 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.100.8/24
        bridge-ports eno50
        bridge-stp off
        bridge-fd 0
#Storage Network (10Gb)

auto vmbr1
iface vmbr1 inet manual
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0
        bridge-vlan-aware yes
        bridge-vids 2-4094
#Tagged VLANs (1Gb)

auto vlan10
iface vlan10 inet static
        address 192.168.1.23/24
        gateway 192.168.1.1
        vlan-raw-device vmbr1
#VLAN 10 (Management Access)

Any thoughts on how I could troubleshoot this further or find a solution? Thanks

 

[tt2468]

Braindead moment. Someone assigned a machine to that management IP and didn't document it, causing an IP conflict. Changed that machine's IP and everything works great now.