Siemens VNC can't be controlled and function keys don't work in a VNC service

26 Aug 2025
Knowledge

Problem

When using a VNC service, it is not possible to control the HMI and the function keys (physically below the HMI screen) cannot be controlled with the on-screen keyboard.

Additionally, when trying to connect using Siemens' Smartclient over VPN, it'll show the error:

ssl handshake failed

Cause

The HMI is running an old firmware version. This behavior was observed with a HMI running firmware 15.0.

Solution

Update the firmware to the latest version. It was observed that updating the HMI to firmware 17.0 resolved both problems.

Title

Siemens VNC can't be controlled and function keys don't work in a VNC service

URL Name

Siemens-VNC-can-t-be-controlled-and-function-keys-don-t-work-in-a-VNC-service

Siemens VNC can't be controlled and function keys don't work in a VNC service

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Siemens VNC can't be controlled and function keys don't work in a VNC service

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