Limitations for Special Characters

Some special characters might not be transmitted through the VNC connection. The processing of special characters depends on the following factors:

  • Keyboard layout configured on the VNC client and on the VNC server
  • VNC viewer in use: An external viewer and the internal viewer behave differently. 
  • Firmware version of the endpoint device
  • UMS user interface: The UMS Console and the UMS Web App have different VNC viewers.

You can specify an external VNC Viewer program from another provider in the UMS Console:

Click on Misc > Settings > Remote Access.

To pass on the IP address of the device to an external application, add the parameters and in External VNC Viewer.


  • TightVNC: "C:\Program Files\TightVNC\tvnviewer.exe" <hostname>:<port>
  • UltraVNC: "C:\Program Files\uvnc\UltraVNC\vncviewer.exe" -connect <hostname>:<port>
  • RealVNC: "C:\Program Files\RealVNC\VNC Viewer\vncviewer.exe" <hostname>:<port>
  • TigerVNC: "C:\Program Files\TigerVNC\vncviewer.exe" <hostname>:<port>

    Place the program path in double quotation marks as shown above to ensure that the call-up works even if there are spaces in the path.