On the server Hetzner Rescue- the system has been installed Proxmox. The installation was done without problems. But when you try to connect by ip: 8006 the browser gave error: ERR_EMPTY_RESPONSE. As it turned out then there is no problem. You just need to connect by HTTPS.

Update 1: In version 4.1 Google Chrome gave this error and for http and https. At the same time in the Mozilla Firefox everything worked perfectly.

The logs:

Sometimes it helps to reinstall pve-manager:

Update 2: Google Chrome error does not occur when entering by DNS name instead of ip-addresses.