RealVNC Server is not licensed correctly

If you see the following error:

RealVNC Server is not licensed correctly. Connections will be prohibited until a valid subscription is applied.

...then it may be that RealVNC Server is conflicting with an offline license already present on your system from an earlier, incompatible version of our RealVNC Server software (version 4.x or 5.x). 

If you know that you've had legacy RealVNC Server software installed on the computer before, then you'll need to remove the old offline license. It may be that simply restarting RealVNC Server is sufficient to solve the problem. If not, then follow the platform-specific instructions below.

Note: If you've never had legacy RealVNC Server software installed on the computer, then this error means something else is wrong with your RealVNC Connect subscription. Please contact us.

Windows

In an Administrator Command Prompt, run the command:

"C:\Program Files\RealVNC\VNC Server\vnclicense.exe" -remove

If this does not help, check the Registry for values referring to vncserver_license in the following locations:

HKEY_LOCAL_MACHINE\SOFTWARE\RealVNC\
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\RealVNC\
HKEY_LOCAL_MACHINE\SOFTWARE\RealVNC\vncserver
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\RealVNC\vncserver

If there are no matching values, please also check for WinVNC4_License in:

HKEY_LOCAL_MACHINE\SOFTWARE\RealVNC\WinVNC4
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\RealVNC
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\WinVNC4

Mac / Linux

In a Terminal window, run the command:

sudo vnclicense -remove

If this does not help, check the filesystem for license files in the following locations:

/etc/vnc/
/etc/vnc/policy.d/
/etc/vnc/licenses/