My boss wanted a server setup that can easily turned off 1 node for maintenance or add extra storages. So I begin to learned about High Availability first to automate the migration of my VMs and LXC containers that contained our Nextcloud server and a bunch of others for our projects, all through the Nginx reverse proxy installed on host. However, I cannot find any spared computers for the other 2 nodes so I figured out that I will install Proxmox to 3 VMs on my Proxmox server and make a reverse proxy their IP to port 11000, 12000 and 13000 on host for practice. But when I type the IP with the port and entered the web interfaces, I constant got error 401 on both 3 webs. I have followed the instruction at https://pve.proxmox.com/wiki/Web_Interface_Via_Nginx_Proxy to config the reverse proxy on the VM but the problem still continued. I don't know what I need to do for the host reverse proxy to fixed the error 401 completely.