I'm receiving the error "No Matching Security Types".

You will receive this error when:

1. You try to connect to a VNC Server that has encryption set to 'always on' from a VNC Viewer that does not support encryption
2. You are connecting from an Enterprise/Personal Edition Viewer that has encryption set to 'always on' to a VNC Server that does not support encryption.

It is not possible to connect without encryption when using Personal or Enterprise edition software, so it is most likely that:

- You are using VNC Free Edition Viewer
- You are using a 3rd party VNC Viewer
- You are connecting to a  VNC Free Edition Server
- You are connecting to a 3rd party VNC Server

You can check what version of VNC Viewer you are running by:

Windows: Selecting the 'about' box from the main viewer window.
Unix: It will display the VNC version when you run an instance of vncserver from a terminal.

You can download the Enterprise/Personal edition of VNC here. Both the Enterprise/Personal editions of VNC support encryption.

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