[SOLVED] Can no longer access the GUI from a desktop browsers, cellphone browser is fine

[ForTheLong]

I have Proxmox running on 2 devices on my local network. For one device I can reach the GUI no problem, for the other device I can reach the Proxmox GUI from my cellphone (Brave) & curl locally from within the device however from my Windows PC (Brave) & my Linux PC (Mozilla) I get "ERR_CONNECTION_RESET"

Issue occurred after I made a change the vmbridge cidr, restarted service, lost all connection, restarted device, booted into the device directly, updated /etc/network/interface to undo my change. Confirmed /etc/host was still as I expected. restarted services, rebooted, I've tried updatecertificate -f

I've tried to disable all firewalls on my windows device, cache is disabled,

watching the pveproxy logs I see the cellphone requests come in but not the computer requests because it doesnt connect
running TCPDUMP on the Proxmox device I can see my laptop requests

checked ss and *:8006 is listening
proxmox device can successfully reach other devices on the network & internet

No idea what else I can try other than wipe everything and start over but I wan't to learn to fix the issue so I don't end up right back here again in a few days. Additionally I just finished making a series of CTs that I don't want to lose

What am I missing ?

 

[bbgeek17]

Check for evidence of duplicate IP

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Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[ForTheLong]

Solved it ! and I could be wrong about how the network works but my suspicion of the issue was:

I reduced the size of the CIDR on the vmbrg0 in an attempt to carve out an IP Space for all resources related to it. However it was too short a range to include my computers which have static IPs on one end of the network but my cellphone uses dhcp which lands in the middle. So accessing from a device within the CIDR worked, accessing from a device on the same network but not in the range did not work regardless of the firewalls being disabled or allowing all traffic from the /24 network