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Yes, when the setup was up and running, I had closed every port, verified further by nmap, and did only allow incoming 80 and outgoing 80 (egress filtering via apf-firewall). Proxmox ports had only been allowed for my ip. All is possible: Maybe a zero-day between floods against the server...

No. 2 Installations, two compromises within minutes. The only thing I know it is not Proxmox related as I also did another run with plain Debian 7. The problem is there are too much possibilities and to less time to figure things out, as usual.

I have a standard vmbr0 setup with only containers that use venet devices. One container with it's own IP address has a webserver where I detected that it answers requests with a javascript redirect and can act like a proxy to the webserver itself. I thought and hoped only the container is...