Configure Proxmox host for TLS connections: This configures the host to accept VNC connections.

aptitude install openbsd-inetd

Run this to get your KVM id’s :

qm list

root@homenet-home10 /etc # qm list
VMID NAME STATUS MEM(MB) BOOTDISK(GB) PID 
101 freenas stopped 1024 32.00 0 
102 debpbx running 512 0.00 573304 
105 winxp stopped 512 15.01 0 
7012 ltsp-ldap-openfire-KVM running 512 9.00 495870 
7016 fbc16-kvm running 512 8.00 462697 
7159 win7 stopped 2048 0.00 0 
27014 ltsp-term-KVM stopped 512 0.00 0

edit /etc/inetd.conf , put a port for each kvm you want to access using kvm

#port kvm
59055 stream tcp nowait root /usr/sbin/qm qm vncproxy 105
59058 stream tcp nowait root /usr/sbin/qm qm vncproxy 7159

restart openbsd-inetd

/etc/init.d/openbsd-inetd restart

test/debug host set up

This shows a working set up:

telnet home10 59058 # home10 is the hostname of my prox 2.0 test server.
Trying 192.168.1.10...
Connected to home10.fantinibakery.com.
Escape character is '^]'.
RFB 003.008

to exit press these 2 keys: control and ]

then type exit to quit that.

Now using tigervnc with TLS Encryption log with root@pam -rootpassword ( I have tried other user login, only root)

Ref: https://pve.proxmox.com/wiki/Vnc_2.0