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ViewBoard® Cast is designed to be easy to use, please contact your sales representative or IT department if you experience any problems. Below are some issues that you may experience.

Additionally you are welcome to visit, "ViewSonic Online Support Center" with the link:

Device List is Not Displayed

Please make sure you have followed all instructions for connecting to the same network segment environment carefully.

Unable to Connect to ViewBoard® Cast Download Page

Ensure that the firewall for your operating system permits ViewBoard® Cast to run and communicate on your network.

This message will only appear if the server is using a self-signed certificate with an invalid trust chain.

Network Requirement

ViewBoard® and mobile devices need to link to be connected to the same LAN network subnet when the PIN/Connect-Code is disabled. ViewBoard® Cast supports cross sub-network connectivity via PIN/Connect-Code.

For the most stable transmission, having ViewBoard® connected via Ethernet cable and having client devices working on a 5GHz Wi-Fi band is recommended.


  • TCP 56789, 25123, 8121 & 8000
  • UDP 48689, 25123