UltraVnc SC (Single Click)

What is SC?

UltraVNC SC is a mini (166k) UltraVNC Server that can be customized and preconfigured for download by a Customer. UltraVNC SC does not require installation and does not make use of the registry. The customer only have to download the little executable and Click to make a connection. The connection is initiated by the server, to allow easy access thru customers firewall.

What is the difference between UltraVNC and UltraVNC SC?

  • Size: UltraVNC is about 850k while SC is only about 166k
  • SC can only do a reverse connection while the normal version server can listen to viewer connections.
  • SC can NOT be run as a service, no logon or Ctrl-Alt-Del is supported.
  • SC can only do File Transfers, Directory transfer is not yet supported (but will be soon).
  • SC don't use registry and password. Settings are preconfigured, password is not needed for an outgoing connection.

How secure is UltraVNC SC?

  • The SC version is initiated by the person that shares his desktop: he needs to voluntary click to initiate the connection.
  • You can use up to 128bit encryption. The encryption level depends on the OS and installed MS Crypto api.
  • The server can only connect to the IP address you have predefined.
  • No incoming connections, no unattended service connection.
  • SC is automatically and systematically uninstalled when the connection is closed.

How to create my own version?

  1. Download custom.zip.
  2. Replace the icons ,bmp and rc4.key file with your own version
    Bmp needs to be a windows bitmap, max colors 256, size 196x181 (16colors ? smaller size)
    Icons, standard window icons: only 32x32 standard is needed
    The bigger the icons and bmp are, the bigger the final result, the final result is 166k + compressed zip file
    SAME NAMES MUST BE USED logo.bmp icon1.ico icon2.ico
  3. Replace the rc4.key with your own version or remove the rc4.key if you don't wish to use encryption
    To create your own key you need the normal UltraVnc version and DSM plugin.
    The config button of the DSM plugin allows you to create another key.
  4. helpdesk.txt see below
  5. Color background:
    You can add a color background by adding a file background.bmp to the zip file
    Size 1x283, this bmp is stretched as background

    (The samples are already stretched here.)
  6. Create a zip File from the files you want to customize
    minimum: helpdesk.txt
    maximum: helpdesk.txt rc4.key icon1.ico icon2.ico logo.bmp background.bmp

    MYCOMPANY.zip or jsdgf654324f.zip
    Use something unique, else 2 custom versions could get mixed
    DON'T use .(dot) in the name: sample WWW.XXX.zip
  7. Open the UltraVNC SC Creator tool and login:
    Userid: foo

Syntax helpdesk.txt

The [PARAMETER TAG] take 0,1 or 2 lines as input.

[HOST] section

  • Line 1: Visible part in selector
  • Line 2: startup command line
  • -connect ip:port: Viewer ip and port
  • -noregistry: needed for SC
  • -plugin: Use encryption, option needs to be before -connect parameter
  • -id id: The id used for repeater connection, -connect is in that case the repeater ip port


UltraVnc SC

Internet support
-connect -noregistry
Internet support encryption
-plugin -connect -noregistry
Double Click to make a connection
Before making a connection
Please Call 56 576896 to get your ticket
(empty to clean line)
Kasteelpleinstraat 56
Ultravnc PC support
More Info

Trying to connect
line 1
line 2
line 3
Connected to
line test1
line test2
line test3

Balloon1 = While trying to connect
Balloon2 = During connection

If you add [DIRECT] and only have 1 [HOST] defined, the menu is not shown and the connection is direct started. (can be useful for scripting) [DIRECT] doesn't have a parameter line.

How to use encryption?

Create your own key to add to custom.zip

  • Open viewer: If you don't have the dsm plugin in the box, you need to copy the plugin to the viewer directory.

  • If you don't have the plugin on your system, the plugin can be downloaded from http://ftp.erm.tu-cottbus.de/ultravnc/Driver19/MSRC4Plugin.dsm

  • Select "Use DSMplugin"
  • Click Config and generate a new key (Gen key). Use same path in all fields, this is more easy.
  • Add the key to custom.zip
    Don't forget to add the "-plugin", see sample helpdesk.txt (second host label)
  • Start Viewer with encryption key with the following command line
    vncviewer -listen -dsmplugin MSRC4Plugin.dsm