MS Logon broken after Windows 10 Upgrade

[Tobei]

Hi,

we made following observation, after we made a upgrade from Windows 10 1607 to 1709, the UltraVNC MS Logon user authentication is broken. If we do a fresh installation of Version 1607 or directly 1709 there is no problem. We can reproduce the issue. This only happens after a upgrade.

We are using UltraVNC Version 1.2.1.7 If the computer is a part of a Active Directory the AD Authentication is still working, but authenticating as a local Administrator is broken after the upgrade. The viewer gets the message:

authentication rejected

Extract from our "ultravnc.ini":

Code: Select all

[admin_auth]
group1=vncusers
group2=Administrators
group3=
locdom1=2
locdom2=0
locdom3=0

When we change the server configuration to "New MS Logon" Authentication we get the VNC server back to work, but we want to rollout the server part fully automated ... so we decided back then to use the "old authentication method".

We enabled the debug log function and get following output:

Thu Mar 8 17:04:37 2018
vncserver.cpp : authhosts set to ""
vncproperties.cpp : ***** DBG - Load User Preferences
vncproperties.cpp : clearing user settings
c:\users\rudi\desktop\ultravnc\winvnc\winvnc\vncpasswd.h : PASSWD : FromClear called
vsocket.cpp : VSocket() m_pDSMPlugin = NULL
vncserver.cpp : trying port number 5900
vsocket.cpp : VSocket() m_pDSMPlugin = NULL
Thu Mar 8 17:04:38 2018
vsocket.cpp : closing socket
vncproperties.cpp : $$$$$$$$$$ ApplyUserPrefs - Plugin Enabled - Call SetDSMPlugin()
vncserver.cpp : $$$$$$$$$$ SetDSMPlugin - Entry
vncserver.cpp : $$$$$$$$$$ SetDSMPlugin - Enabled
vncserver.cpp : $$$$$$$$$$ SetDSMPlugin - Plugin NOT loaded - Try to load it
vncsockconnect.cpp : started socket connection thread
--Falscher Parameter.
vncserver.cpp : $$$$$$$$$$ SetDSMPlugin - Plugin successfully loaded
vncserver.cpp : $$$$$$$$$$ SetDSMPlugin - Init plugin call
--Die Syntax für den Dateinamen, Verzeichnisnamen oder die Datenträgerbezeichnung ist falsch.
vncserver.cpp : $$$$$$$$$$ SetDSMPlugin - SetPluginParams call
vncserver.cpp : DSMPlugin Params OK
c:\users\rudi\desktop\ultravnc\winvnc\winvnc\vncpasswd.h : PASSWD : ToText called
Thu Mar 8 17:04:43 2018
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncproperties.cpp : ***** DBG - Force USER SYSTEM 2
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
Thu Mar 8 17:04:48 2018
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncproperties.cpp : ***** DBG - Force USER SYSTEM 2
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0

Any idea what we are doing wrong, or is this a real bug? We can gladly provide more informations.


Greeting Tobias

[Rudi De Vos]

i will add it to the todo list... current no time do debug this one.

[Tobei]

Hi Rudi,

thanks for reading and your feedback. Feel free to ask me later if you want any further information.


Greeting Tobias

[tyrant00]

Greetings,

we are also getting this message in logs. In fact, logs show these events occur every 5-15 seconds and therefore pumping up the log file pretty fast.

Code: Select all

Tue Nov 26 15:09:37 2019
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncproperties.cpp : ***** DBG - Force USER SYSTEM 2
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncservice.cpp : @@@@@@@@@@@@@ GetCurrentUser - Error: Usersize 0
vncmenu.cpp : ############### Usernames change: old="", new=""

Using UltraVNC Server 1.2.1.2 with [x]Require MS Logon and encryption Plugin "SecureVNCPlugin64.dsm" on Windows Server 2016 Standard x64.

Any solution to this yet?

[Rudi De Vos]

This messge is from the menu.
Vnc try to set the vnc Systray menu, but to set it there need to be a systray.
As long as there is no Desktop/user logged on, this info is displayed every 5 secs.

Gonna remove it from the logging as it seems to be a "real error"