vnc password do not take effect

[aleegreat]

Describe the bug
I used vncpasswd to set Nightnight as the password , but i can login use Nightnigh or Nightnightt

**Server info: **
OS : archlinux (lxc on pve)
VNC Server : tigervnc 1.12.0-1
VNC downloaded from : archlinux , use command pacman -S tigervnc

client info:
OS: mac os 12.1
vnc client : tigervnc viewer 64-bit 1.12.0
vnc lient download : here : https://sourceforge.net/projects/tigervnc/files/stable/1.12.0

config info:

#  cat vncserver.users 
# TigerVNC User assignment
#
# This file assigns users to specific VNC display numbers.
# The syntax is <display>=<username>. E.g.:
#
# :2=andrew
# :3=lisa

:1=fate

#  cat vncserver-config-defaults 
## Default settings for VNC servers started by the vncserver service
#
# Any settings given here will override the builtin defaults, but can
# also be overriden by ~/.vnc/config and vncserver-config-mandatory.
#
# See HOWTO.md and the following manpages for more details:
#     vncsession(8) Xvnc(1)
#
# Several common settings are shown below. Uncomment and modify to your
# liking.

# session=gnome
# securitytypes=vncauth,tlsvnc
# geometry=2000x1200
# localhost
# alwaysshared

#  cat vncserver-config-mandatory 
## Mandatory settings for VNC servers started by the vncserver service
#
# Any settings given here will override the builtin defaults and
# settings specified in ~/.vnc/config or vnc-config-defaults.
#
# See HOWTO.md and the following manpages for more details:
#     vncsession(8) Xvnc(1)
#
# Several common settings are shown below. Uncomment and modify to your
# liking.

# session=gnome
# securitytypes=vncauth,tlsvnc
# geometry=2000x1200
# localhost
# alwaysshared

logs:

$ cat archlinux:1.log 
Using desktop session plasma

New 'archlinux:1 (fate)' desktop is archlinux:1

Starting desktop session plasma


Xvnc TigerVNC 1.12.0 - built Nov 13 2021 18:03:45
Copyright (C) 1999-2021 TigerVNC Team and many others (see README.rst)
See https://www.tigervnc.org for information on TigerVNC.
Underlying X server release 12009000, The X.Org Foundation


Sun Jan  2 09:22:25 2022
 vncext:      VNC extension running!
 vncext:      Listening for VNC connections on all interface(s), port 5901
 vncext:      created VNC server for screen 0
xinit: XFree86_VT property unexpectedly has 0 items instead of 1
Running X session wrapper
Loading profile from /etc/profile
Loading xinit script /etc/X11/xinit/xinitrc.d/40-libcanberra-gtk-module.sh
Loading xinit script /etc/X11/xinit/xinitrc.d/50-systemd-user.sh
X session wrapper complete, running session /usr/bin/startplasma-x11

Sun Jan  2 09:22:27 2022
 Connections: accepted: 192.168.1.12::52718
 SConnection: Client needs protocol version 3.8
 SConnection: Client requests security type VeNCrypt(19)
 SVeNCrypt:   Client requests security type TLSVnc (258)

Sun Jan  2 09:22:30 2022
 VNCSConnST:  Server default pixel format depth 24 (32bpp) little-endian rgb888

Sun Jan  2 09:22:33 2022
 VNCSConnST:  closing 192.168.1.12::52718: Clean disconnection
 EncodeManager: Framebuffer updates: 5
 EncodeManager:   Tight (JPEG):
 EncodeManager:     Full Colour: 2 rects, 900 pixels
 EncodeManager:                  2.44043 KiB (1:1.45018 ratio)
 EncodeManager:   ZRLE:
 EncodeManager:     Full Colour: 15 rects, 786.432 kpixels
 EncodeManager:                  1004.23 KiB (1:3.05923 ratio)
 EncodeManager:   Total: 17 rects, 787.332 kpixels
 EncodeManager:          1006.67 KiB (1:3.05533 ratio)
 Connections: closed: 192.168.1.12::52718
 ComparingUpdateTracker: 0 pixels in / 0 pixels out
 ComparingUpdateTracker: (1:-nan ratio)

Sun Jan  2 09:22:38 2022
 Connections: accepted: 192.168.1.12::52739
 SConnection: Client needs protocol version 3.8
 SConnection: Client requests security type VeNCrypt(19)
 SVeNCrypt:   Client requests security type TLSVnc (258)

Sun Jan  2 09:22:42 2022
 VNCSConnST:  Server default pixel format depth 24 (32bpp) little-endian rgb888

Sun Jan  2 09:23:41 2022
 VNCSConnST:  closing 192.168.1.12::52739: Clean disconnection
 EncodeManager: Framebuffer updates: 6
 EncodeManager:   Tight:
 EncodeManager:     Indexed RLE: 1 rects, 192 pixels
 EncodeManager:                  442 B (1:1.76471 ratio)
 EncodeManager:   Tight (JPEG):
 EncodeManager:     Full Colour: 2 rects, 828 pixels
 EncodeManager:                  1.76953 KiB (1:1.84106 ratio)
 EncodeManager:   ZRLE:
 EncodeManager:     Full Colour: 15 rects, 786.432 kpixels
 EncodeManager:                  1003.51 KiB (1:3.06144 ratio)
 EncodeManager:   Total: 18 rects, 787.452 kpixels
 EncodeManager:          1005.71 KiB (1:3.05874 ratio)
 Connections: closed: 192.168.1.12::52739
 ComparingUpdateTracker: 45.056 kpixels in / 192 pixels out
 ComparingUpdateTracker: (1:234.667 ratio)

Sun Jan  2 09:23:44 2022
 Connections: accepted: 192.168.1.12::52868
 SConnection: Client needs protocol version 3.8
 SConnection: Client requests security type VeNCrypt(19)
 SVeNCrypt:   Client requests security type TLSVnc (258)

Sun Jan  2 09:23:48 2022
 VNCSConnST:  Server default pixel format depth 24 (32bpp) little-endian rgb888
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = V path = `V pid = 2549
KCrash: Arguments: Unable to start Dr. Konqi
OpenGL vendor string:                   Mesa/X.org
OpenGL renderer string:                 llvmpipe (LLVM 13.0.0, 256 bits)
OpenGL version string:                  4.5 (Compatibility Profile) Mesa 21.3.3
OpenGL shading language version string: 4.50
Driver:                                 LLVMpipe
GPU class:                              Unknown
OpenGL version:                         4.5
GLSL version:                           4.50
Mesa version:                           21.3.3
X server version:                       1.20.9
Linux kernel version:                   5.13.19
Requires strict binding:                yes
GLSL shaders:                           yes
Texture NPOT support:                   yes
Virtual Machine:                        no

[CendioOssman]

VNC passwords are unfortunately limited to 8 characters. Please see #370 for warning about this, and #891 for supporting something longer.