Remote connection UltraVNC always aborts 1s after connection

[keith]

Remote connection UltraVNC always aborts 1s after connection.
In the application event logs we found the following error:

Faulting application name: WinVNC.exe, version: 1.2.1.7, time stamp: 0x5a566ca1
Faulting module name: WinVNC.exe, version: 1.2.1.7, time stamp: 0x5a566ca1
Exception code: 0xc0000005
Fault offset: 0x00000000000cf93b
Faulting process id: 0x2c28
Faulting application start time: 0x01d4727af82db6f6

The workstations is set up with 3 displays:
Display 1:
Connected to adapter: Barco MXRT 2600 (WDDM) (\Registry\Machine\System\CurrentControlSet\Control\Video\{5D142E2C-5A29-4C90-8569-58E4749E5666}\0000)
Primary Display Device: NO
Monitor Model Name: MDNC-2221
Color Type: Color
Driver: CDD
Resolution: 1600x1200
Color Depth: 32-bit color
Refresh Rate: 60 Hz
Displayed Format: 30 bits

Current Timing Mode:
1600 X 1200 @ 60 Hz
Pixel clock: 130.250 MHz
Horiz active: 1600
Horiz blank total: 160
Horiz front porch: 48
Horiz sync time: 32
Vert active: 1200
Vert blank total: 35
Vert front porch: 3
Vert sync time: 4
Resulting hfreq: 74.01 kHz
Resulting vfreq: 59.93 Hz
Color depth: 10 10 10
Flags: 0x4

Display 2:
Connected to adapter: Barco MXRT 2600 (WDDM) (\Registry\Machine\System\CurrentControlSet\Control\Video\{CDFA4AB5-4619-4487-A894-6DEC7B9AEFE6}\0000)
Primary Display Device: NO
Monitor Model Name: MDNC-2221
Color Type: Color
Driver: CDD
Resolution: 1600x1200
Color Depth: 32-bit color
Refresh Rate: 60 Hz
Displayed Format: 30 bits

Current Timing Mode:
1600 X 1200 @ 60 Hz
Pixel clock: 130.250 MHz
Horiz active: 1600
Horiz blank total: 160
Horiz front porch: 48
Horiz sync time: 32
Vert active: 1200
Vert blank total: 35
Vert front porch: 3
Vert sync time: 4
Resulting hfreq: 74.01 kHz
Resulting vfreq: 59.93 Hz
Color depth: 10 10 10
Flags: 0x4

Display 3:

Connected to adapter: Barco MXRT 2600 (WDDM) (\Registry\Machine\System\CurrentControlSet\Control\Video\{5D142E2C-5A29-4C90-8569-58E4749E5666}\0001)
Primary Display Device: YES
Monitor Model Name: E223W
Color Type: unknown color type
Driver: CDD
Resolution: 1680x1050
Color Depth: 32-bit color
Refresh Rate: 60 Hz
Displayed Format: 24 bits

Current Timing Mode:
1680 X 1050 @ 60 Hz
Pixel clock: 146.250 MHz
Horiz active: 1680
Horiz blank total: 560
Horiz front porch: 104
Horiz sync time: 176
Vert active: 1050
Vert blank total: 39
Vert front porch: 3
Vert sync time: 6
Resulting hfreq: 65.30 kHz
Resulting vfreq: 59.96 Hz
Color depth: 8 8 8
Flags: 0x4

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Ultravnc2_is1]
"Inno Setup: Setup Version"="5.5.9 (a)"
"Inno Setup: App Path"="C:\\Program Files\\UltraVNC"
"InstallLocation"="C:\\Program Files\\UltraVNC\\"
"Inno Setup: Icon Group"="UltraVNC"
"Inno Setup: User"="lokadmin"
"Inno Setup: Setup Type"="custom"
"Inno Setup: Selected Components"="ultravnc_server_s"
"Inno Setup: Deselected Components"="ultravnc_server,ultravnc_viewer,ultravnc_repeater,ultravnc_upgrade"
"Inno Setup: Selected Tasks"="installservice,startservice"
"Inno Setup: Deselected Tasks"="desktopicon"
"Inno Setup: Language"="de"
"DisplayName"="UltraVnc"
"UninstallString"="\"C:\\Program Files\\UltraVNC\\unins000.exe\""
"QuietUninstallString"="\"C:\\Program Files\\UltraVNC\\unins000.exe\" /SILENT"
"DisplayVersion"="1.2.1.7"
"Publisher"="uvnc bvba"
"URLInfoAbout"="http://www.uvnc.com"
"HelpLink"="http://forum.ultravnc.info"
"URLUpdateInfo"="http://www.uvnc.com"
"NoModify"=dword:00000001
"NoRepair"=dword:00000001
"InstallDate"="20181008"
"MajorVersion"=dword:00000001
"MinorVersion"=dword:00000002
"VersionMajor"=dword:00000001
"VersionMinor"=dword:00000002
"EstimatedSize"=dword:0000263a
"SystemComponent"=dword:00000001
"sEstimatedSize2"=dword:00001f8c

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\VivantesPackages UltraVNC.org UltraVNC Server 1.2.1.7]
"DisplayName"="VivantesPackages UltraVNC.org UltraVNC Server 1.2.1.7"
"DisplayIcon"="C:\\Program Files\\VivantesPackages\\UltraVNC.org\\UltraVNC Server\\1.2.1.7\\Install\\Setup.ico,0"
"Publisher"="UltraVNC.org"
"DisplayVersion"="1.2.1.7"
"PackageGUID"=""
"UninstallString"="\"C:\\Program Files\\Common Files\\Setup64\\Setup.exe\" \"C:\\Program Files\\VivantesPackages\\UltraVNC.org\\UltraVNC Server\\1.2.1.7\\Install\\Setup.inf\" /X4"
"MachineKeyName"="VivantesPackages\\UltraVNC.org\\UltraVNC Server\\1.2.1.7"

Updating to the latest version of Ultra VNC does not solve the issue, connecting different spam monitor the connection works as normal.
What troubleshooting steps would you advice?

[Rudi De Vos]

Need more info
OS vnc server ?
Capture method ? ddengine / mirror / system
ultravnc.ini ( erase the passwd )

[keith]

version of VNC-server is 1.2.1.7.
Where can I find the capture method? ddengine / mirror / system
untravnc.ini settings:
[ultravnc]
passwd=
passwd2=
[admin]
UseRegistry=0
MSLogonRequired=1
NewMSLogon=1
DebugMode=0
Avilog=0
path=%programfiles%\UltraVNC
service_commandline=
accept_reject_mesg=Das Fernwartungsprogramm WinVNC empfaengt eine eingehende Verbindung von
DebugLevel=8
DisableTrayIcon=0
rdpmode=0
LoopbackOnly=0
UseDSMPlugin=0
AllowLoopback=0
AuthRequired=1
ConnectPriority=1
DSMPlugin=
AuthHosts=
DSMPluginConfig=SecureVNC;0;0x00104001;
AllowShutdown=0
AllowProperties=0
AllowEditClients=0
FileTransferEnabled=1
FTUserImpersonation=1
BlankMonitorEnabled=0
BlankInputsOnly=0
DefaultScale=1
CaptureAlphaBlending=1
BlackAlphaBlending=0
primary=1
secondary=1
SocketConnect=1
HTTPConnect=1
XDMCPConnect=0
AutoPortSelect=1
PortNumber=0
HTTPPortNumber=0
IdleTimeout=0
IdleInputTimeout=0
RemoveWallpaper=1
RemoveAero=1
QuerySetting=4
QueryTimeout=30
QueryAccept=2
QueryIfNoLogon=0
InputsEnabled=1
LockSetting=0
LocalInputsDisabled=0
EnableJapInput=0
FileTransferTimeout=30
kickrdp=0
clearconsole=0
[admin_auth]
group1=
group2=
group3=
locdom1=0
locdom2=0
locdom3=0
[poll]
TurboMode=1
PollUnderCursor=0
PollForeground=1
PollFullScreen=1
OnlyPollConsole=0
OnlyPollOnEvent=0
MaxCpu=80
EnableDriver=1
EnableHook=1
EnableVirtual=0
SingleWindow=0
SingleWindowName=
[UltraVNC]
passwd=
passwd2=

[Rudi De Vos]

[poll]
EnableDriver=1 (mirror driver < win7, ddengine > win7)
EnableHook=1 (system)