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): Mac OS X PRODUCT(S): VNC VERSION(S): 5.x Issue Mac OS X 10.8 (Mountain Lion) is supported as of VNC version 5.0.2. If you are using 5.0.0 or 5.0.1, upgrade to 5.0.2, particularly if you experience the following issues: ...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): 5.0.0 Issue VNC Server in Service Mode conflicts with RDP. Status Stop VNC Server in order to connect using Remote Desktop Connection. This is fixed in VNC 5.0.1.
PLATFORM(S): Non-specific PRODUCT(S): VNC VERSION(S): - Issue On some VNC Servers, the machine's IP address may not be displayed; the loopback address (127.0.0.1) is displayed instead. This is a bug caused by the get_primary_ip4 scrip...
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...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): < 4.6 Issue VNC Viewer is known to crash occasionally when starting up on Windows 7 systems. This problem affects all versions of VNC Server prior to version 4.6. Status No fix upco...
PLATFORM(S): Non-specific PRODUCT(S): VNC VERSION(S): - Issue Kaspersky 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 mean...
PLATFORM(S): Non-specific PRODUCT(S): Viewer Plus VERSION(S): - Issue This is a known issue in Intel AMT 6.0 and 6.1. When the Operating System turns off the local monitor, the video on the remote AMT KVM session goes black and does n...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue When running the VNC installer on Linux platforms such as Ubuntu 15.04, Debian 8 and Raspbian, you may see the following errors: /usr/bin/vncinitconfig: 1516: /usr/bin/vncinitcon...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): - Issue When running VNC Server in Service mode under Windows Vista or 7, logging out or switching user will terminate the connection. Status Workaround available: VNC Viewer 5.0+...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): - Issue After upgrading from VNC 4.6.x to 5.0, the old firewall exception is not removed and neither is the vncserver_firewallCleanup registry entry. The following error appears in the ...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): - Issue When connecting to VNC Server on Windows using a Windows username and password for authentication - under certain configurations of the VNC Server machine, there is a long delay...
PLATFORM(S): Mac OS X PRODUCT(S): VNC VERSION(S): - Issue When connecting to VNC Server using VNC Viewer for Java running on Mac OS X, screen updates may be slow or unresponsive. The cause is an issue with Java 7. A temporary workarou...
PLATFORM(S): Linux/Unix PRODUCT(S): VNC VERSION(S): - Issue Xinerama is an extension built into some Linux/Unix systems which enables multi-headed applications or window managers to use two or more physical displays as one large virtu...
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): Windows PRODUCT(S): VNC VERSION(S): < 4.6 Issue VNC Server in Service Mode is known to crash when a Windows Vista or Windows 7 system is suspended. This problem affects all versions of VNC Server up to version 4.5. Stat...
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): Ubuntu 11.04 PRODUCT(S): VNC VERSION(S): - Issue After installing VNC Server on Ubuntu 11.04 the sytatus icon is not displayed in the system tray by default. Status You can enable the tray icon by adding VNC Server to...
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 PRODUCT(S): VNC VERSION(S): - Issue When connecting using VNC Viewer from Ubuntu and pressing the Windows/Super key, the Windows/Super key stroke is interpreted by both the local and remote machine. The dash is open...
PLATFORM(S): Non-specific PRODUCT(S): Viewer for iOS VERSION(S): <2.2.2 Issue There are known issues with some keys when using a hardware Bluetooth keyboard on iOS 7: * Keyboard input will only be received if the on-screen keyboar...
PLATFORM(S): Windows PRODUCT(S): Viewer for Java VERSION(S): - Issue If IE9's "ActiveX Filtering" option is enabled, Java applets will be blocked. This needs to be disabled for the RealVNC Java applet to load. For security reasons, it...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue Using the default Gnome desktop with VNC Server in Virtual Mode on Fedora 15 fails with a crash in Metacity. This is an issue with the default gnome or gnome-fallback sessions. ...
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): Fedora 22 PRODUCT(S): VNC VERSION(S): 5.2.3 Issue VNC Server fails to start in Service Mode under Fedora 22 (beta) because it cannot find a running X server. Status Workaround available: The X server on Fedora 22 is ...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue When connecting to VNC Server running on Ubuntu 13.10 or Fedora 19 with multiple monitors, the void region between the monitors shows fragmented images. Status Non-VNC related...
PLATFORM(S): Mac OS X PRODUCT(S): VNC VERSION(S): 5.0.x Issue This is a known issue which we discovered in VNC Server 5.0.x. However, if you double click the .vnc file again while the first VNC Viewer is still open, we have found that...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): 5.3 Issue With SELinux enabled, VNC Server in Service Mode (vncserver-x11-serviced) and the VNC Server in Virtual Mode daemon (vncserver-virtuald) may not work. Status Fixed in VNC 5....
1. The Java Viewer is blocked by Google Chrome 42 and above. This page explains why: https://www.chromium.org/developers/npapi-deprecation [https://www.chromium.org/developers/npapi-deprecation] To work around this, browse to: chrome://flags/#enable-...
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): Linux PRODUCT(S): VNC VERSION(S): - Issue "xdmcp" is not automatically enabled under RHEL 5 or CENTOS 5. Status Workaround available: Set "Enable=true" under the [xdmcp] stanza of "/etc/gdm/custom.conf" to resolve t...
PLATFORM(S): Linux PRODUCT(S): - VERSION(S): - Issue If you encounter problems viewing videos on your Ubuntu 10.10 (or similar) computer, it may be that you will need to disable "Accelerated Video Output" (ie hardware acceleration). ...
PLATFORM(S): Windows PRODUCT(S): VNC VERSION(S): 5.1 Issue When running the MSI installer, the installation of the printer driver fails on Windows XP machines that show the unsigned driver warning and is rolled back. Status Workar...
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): Windows PRODUCT(S): VNC VERSION(S): 5.1 Issue On some Windows systems, media keys (for example, play/pause, volume up/down) may not be sent to VNC Server but may be applied locally. Status Workaround available: Chec...
PLATFORM(S): *NIX PRODUCT(S): VNC VERSION(S): 4.5+ Cause You may see this error when attempting to connect to VNC Server on Linux/UNIX with Single Sign-On configured as the authentication method. It indicates a conflict between the GS...
PLATFORM(S): Linux PRODUCT(S): VNC VERSION(S): - Issue Switching between users leaves the VNC Server with a black screen even when there is no VNC involvement. If you switch between users over a VNC connection, running VNC Server in S...
PLATFORM(S): Unix PRODUCT(S): VNC VERSION(S): - Issue The commands vnclicense, vncserver -list and vncserver-x11 all fail to perform their respective operations when running HP-UX. Status Workaround available: In order for these...
PLATFORM(S): Linux/Unix PRODUCT(S): VNC VERSION(S): - Issue When attempting to run VNC Server in virtual mode, virtual desktops cannot be created if SELinux is enforcing. Status This issue is fixed in VNC 5.3.1+. If you are using ...
PLATFORM(S): Android PRODUCT(S): VNC Viewer for Android VERSION(S): 1.2.9 Issue In the VNC Viewer for Android 1.2.9 release, Swype keyboards don't work. This was narrowed down to a conflict with the Backup and Sync features of these k...
PLATFORM(S): All PRODUCT(S): VNC VERSION(S): 5.3 Issue NOTE: This only affects VNC Server with an Enterprise license. In 5.3, the VNC Server UserPasswdVerifier parameter has been replaced by the Authentication parameter. On upgrade,...
PLATFORM(S): Mac OSX 10.11 PRODUCT(S): VNC VERSION(S): 5.2.3 Cause The pixel format is incorrectly reported/interpreted. The symptom is that the display is incorrectly rendered. Resolution Please contact RealVNC Product Support f...
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...
PLATFORM(S): UNIX/Linux PRODUCT(S): VNC VERSION(S): 5.3.0+ Issue When running vncserver-virtuald -h all to display the usage message, VncAuth is displayed as a valid value for the Authentication parameter when, in fact, it is not a va...
×