Newbie out of their depth - Router changed, can ping Proxmox Host but not access the webGUI

he can ping and ssh into PVE, his local curl command ran from PVE shell to PVE IP hangs. I'd say the issue is in services, not in network.

As an additional test try:
curl -sk https://127.0.0.1:8006|grep title

If it works, you should see something like:
<title>pve7opt6-1 - Proxmox Virtual Environment</title>

P.S. if it still hasnt rebooted - press the power button


Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
Looks like the "web" service is not starting and/or is crashing. Don't know what PVE uses for http service, Apache or something like that.
 
Looks like the "web" service is not starting and/or is crashing. Don't know what PVE uses for http service, Apache or something like that.
Next step, as advised previously, log analyses. Clearly something else changed/happened besides router change.


Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
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Hello! Thank you all so much for your patience and your diagnostic tips.
I started pulling on a thread (almost literally) that it was taking an age to execute basic commands even in the CLI.
Something must have been eating the CPU ---

and after a lot of searching, I found the issue:
https://forum.proxmox.com/threads/systemd-100-cpu-hang.124767/

Guess who hadn't restarted their ProxMox host for 2 months?

So uh, yeah. Network access was all fine. CPU was at 100% and the web interface couldn't load.
Some lessons to learn there I think...
 
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