Knowledge base

Knowledge base : Known Issues
If VNC on the Raspberry Pi [http://www.realvnc.com/raspberrypi] is not running smoothly, use this page to help you troubleshoot your problem. NOTE: If you would like to enable the experimental direct capture feature from the command line, click here [ht...
RealVNC Ltd has a clear track record in providing secure software. Current versions are not affected by any known vulnerabilities. Previous versions released between 2004-2013 have been affected by the following issues: CVE-2013-6886 [http://cve.mitre...
PLATFORM(S): Non-specific PRODUCT(S): VNC VERSION(S): - Issue Some users have experienced slow performance when connecting over VNC. This problem has been identified on Matrox G200-based integrated graphics cards, amongst others, whic...
PLATFORM(S): Mac OS X PRODUCT(S): VNC VERSION(S): - Issue A connected VNC Viewer user cannot automatically wake a Mac computer from deep sleep. See the status section for more information. A VNC Viewer user may be able to wake a Mac...
PLATFORM(S): Linux/UNIX PRODUCT(S): VNC VERSION(S): 5.1 Issue When connecting to VNC Server in Virtual Mode, you may see a grey screen, or the VNC Viewer window may open briefly and then close again. We believe the problem is the way ...
PLATFORM(S): Non-Specific PRODUCT(S): VNC VERSION(S): - Issue There are known issues when running VNC Server on some Macs and PCs that do not have monitors attached. These problems may be caused by the types of graphics card or APIs, ...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue When VNC Server is installed on RHEL6 or CentOS 6, in some instances required fonts are unavailable. During the installation process, the vncinitconfig utility is run to set up th...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue You may experience an issue printing under Fedora 17 onwards, or from CentOS 7 or RHEL 7. The printer appears in the CUPS list and is available from the print menu (though it has ...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): - Issue VNC Server uses VNC Mirror Driver by default to improve performance. VNC Mirror Driver does not support Aero effects. This is a known issue with all mirror drivers (as discussed...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): 5.3.1 Issue In certain circumstances when connecting to VNC Server 5.3.1 on Windows, the VNC Server computer's screen may dim or turn black. Status There is a workaround available: ...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue There is a known issue where the Gnome menus hang after either clicking on the Red Hat menu item or right-clicking and selecting Add to Panel. We believe this is due to a RedHat b...
Cause Connecting to VNC(R) Server for UNIX with Single sign-on produces an error: "The connection closed unexpectedly" VNC Server is in Service Mode is killed and then restarts; in User Mode and Virtual Mode the root helper process is killed no furt...
PLATFORM(S): Linux/Unix PRODUCT(S): VNC VERSION(S): 5.1 Issue When connecting to VNC Server in Virtual Mode using the virtual-mode daemon, the VNC Server's signature displayed on the status dialog does not match the signature displaye...
PLATFORM(S): Non-specific PRODUCT(S): VNC VERSION(S): - Issue It is possible to have a system with 2 or more NICs serving different subnets. If the VNC Server license key is added when both NICs are enabled, then connections can be ma...
PLATFORM(S): Mac OSX 10.11.1-10.11.4 PRODUCT(S): VNC VERSION(S): 5.2.3+ Cause It is not possible to fully interact with Keychain access permissions dialogs in El Capitan 10.11.1 - 10.11.4 with Security Update 2015-007 installed. These...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue In Fedora 19, you can no longer access the bottom taskbar on Fedora by simply moving the mouse to the bottom. You need to swipe it there as it responds to the "pressure" of the cu...
PLATFORM(S): Linux/Unix PRODUCT(S): VNC VERSION(S): - Issue There is a known issue with Ubuntu 12.04 whereby VNC Server running in virtual mode will crash if a system menu is opened over a VNC notification. Status Workaround avail...
PLATFORM(S): Non-specific PRODUCT(S): VNC VERSION(S): - Issue Zone Alarm anti-virus has a built-in feature that disables synthetic input events, such as the remote input events that VNC Viewer sends to VNC Server. This essentially mea...
PLATFORM(S): Mac OS X PRODUCT(S): VNC Viewer for iOS/Android VERSION(S): - Issue When connecting to Apple Screen Sharing built-in to Mac OS X using VNC Viewer for iOS or Android, it is not possible to use the scrolling key bar above t...
PLATFORM(S): All PRODUCT(S): VNC VERSION(S): - Issue When running VNC Viewer with the MRUEntries parameter set to 0, VNC Viewer hangs and does not connect to VNC Server. Status Workaround available: Set the MRUEntries parameter t...
PLATFORM(S): Fedora 19+ PRODUCT(S): VNC VERSION(S): 5.1.0+ Issue Connecting to VNC Server on Fedora 19 and above does not display the tray icon. Status Workaround available: A gnome extension has been written named topIcons [http...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): - Problem Running the command sysprep.exe /generalize removes system-specific settings (https://technet.microsoft.com/en-us/library/cc721940(v=ws.10).aspx [https://technet.microsoft.com...
We believe this is a bug in the current release of MacOS Sierra, which we've raised with Apple's development team for investigation. Until this is resolved, we recommend the following workarounds: * Use the Shift key in the VNC Viewer for iOS (or Andr...
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