Why does PVE 8.4.16 LXC Console show "Connected" but remain a black screen?

Oct 14, 2025
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Hi everyone, I'm encountering a strange LXC issue on Proxmox VE 8.4.16. I have several containers running, and the WebUI Console used to work perfectly. However, one day, the console for CT 109 suddenly went pitch black. It shows "Connected" at the top, but no matter what I type or if I hit Enter, there's no response.

2026-03-10_12-45 console.png

What's weird is that all other CTs are working fine. Also, if I run pct enter 109 from the host node's shell, I can access and manage the system without any issues. This means the container's OS is running fine, but the WebUI terminal display is just not coming through.

2026-03-10_12-46 ts.png

Has anyone experienced this? How can I get the console display back?