What are the possible causes if the proxmox web interface cannot be accessed anymore when I was able to access it 4 hours ago? I just checked the router and yet Port 443 is already forwarded to the host machine. The VM (debian) hosted on it which runs our website can still be accessed.. 
---SOLVED. Proxmox changes itself to be using the 2nd NIC (eth1). I just don't know for what reason.
---SOLVED. Proxmox changes itself to be using the 2nd NIC (eth1). I just don't know for what reason.
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