VNC® Enterprise Edition 4.1 - known bugs and features
The following are known bugs, features and omissions in VNC Enterprise Edition 4.1. You may also wish to check the known bugs, features and omissions in VNC 4.0.
| Date | ID | Platform / Program | Description | Workaround | Status |
|---|---|---|---|---|---|
| 12 Jul 2004 | 4 | Windows server | When Ctrl-Alt-Del is sent remotely to the VNC server, causing the Logon dialog to be shown, the username and password fields may appear grayed out. This behaviour has only been reported under Windows 2003 systems. | Cancel the Logon dialog and send Ctrl-Alt-Del again. | Reported only to affect VNC 3.x servers |
| 1 Sep 2004 | 9 | Windows server | The Control and Alt keys can become "stuck" when the Send Ctrl-Alt-Del command is used remotely. | Press and release each key a couple of times from a new viewer session, to cause the server to reset the keys' states. | Under consideration |
| 1 Sep 2004 | 10 | Windows viewer | When Fullscreen mode is selected via the F8 menu, the Windows taskbar can remain on top of the VNC viewer window. | Use the system menu (accessible via the icon at the top left
of the VNC viewer window) to enter Fullscreen mode - the bar will
then dissappear after a short delay. or Click on the taskbar, then back on the VNC viewer window - the bar will dissappear. |
Under consideration |
| 10 Mar 2005 | 11 | Windows server | The tray icon's tooltip is sometimes not visible, or displays out of date information. | None | Fixed in VNC Enterprise Edition 4.1.4 |
| 10 Mar 2005 | 12 | Windows viewer | VNC Viewer does not respect the Monitor parameter, and the viewer window can appear behind the toolbars if they are at the top or left of the display. | None | Fixed in VNC Enterprise Edition 4.1.4 |
| 10 Mar 2005 | 13 | Windows server | The Disable local inputs option does not take effect the first time that the server is accessed. | Disconnect all viewers, then reconnect. | Fixed in VNC Enterprise Edition 4.1.4 |
| 10 Mar 2005 | 14 | Windows server | If the Desktop->Remove wallpaper option is enabled when runnign under pre-XP versions of Windows then Active Desktop enabled when the last viewer disconnects, regardless of whether it was originally enabled. | In the Active Desktop content settings, ensure that all web content are unticked. | Fixed in VNC Enterprise Edition 4.1.4 |
| 10 Mar 2005 | 15 | Windows installer | If the installer is used to upgrade or replace an existing installation that is still in use, the user will be prompted to reboot the machine, even under Windows NT based systems. | Ensure that no VNC components are running before upgrading/replacing existing installations. | Fixed in VNC Enterprise Edition 4.1.4 |
| 29 Mar 2005 | 17 | Windows Viewer Enterprise Edition 4.1.4 | VNC Viewer Enterprise Edition 4.1.4 may crash while saving a .vnc configuration file for the current connect. | No workaround | Fixed in VNC Enterprise Edition 4.1.5 |
| 29 Mar 2005 | 18 | Windows Viewer & Server Enterprise Edition 4.1.4 & Free Edition 4.1 | Western European accented characters as defined by ISO-8859-1 are stripped out when clipboard data is exchanged between viewer and server, in spite of being officially supported by the RFB protocol specification. | No workaround | Fixed in VNC Enterprise Edition 4.1.5 |
| 29 Mar 2005 | 19 | Windows Server Enterprise Edition | NT Logon & Single Sign-On authentication can fail if no Domain Controller is accessible for session information to be logged to, or if the Domain Controller's event logs can't be accessed when VNC Server is in User-Mode. | Ensure that all Domain Controller's Application Event Logs are accessible, and are writable by Domain Users. | Fixed in VNC Enterprise Edition 4.1.5 |
| 29 Mar 2005 | 20 | Windows Server | Although "Only prompt when there is a user logged on" may be configured for VNC Server on Windows 9x/Me/NT4/2000, the setting does not take effect, because VNC Server does not in fact support the option under these platforms. | No workaround | Fixed in VNC Enterprise Edition 4.1.5 |
| 29 Mar 2005 | 21 | Windows Server | The tray icon tooltip continues to display the host computer's full set of IP addresses even when VNC Server has been configured to accept connections only from the local machine. | No workaround | Fixed in VNC Enterprise Edition 4.1.5 |
| 29 Mar 2005 | 22 | Windows Server Enterprise Edition 4.1.5, Personal Edition 4.1 | When connecting to a server over a slower connection, VNC Viewer can mistakenly switch temporarily into low-compression (Hextile) mode, and permanently into full-color mode. | Disable Auto-select in the VNC Viewer's Colour / Encoding settings, and choose the correct settings manually. | Fixed in VNC Enterprise Edition 4.1.6 |
| 31 Mar 2005 | 23 | Windows Viewer Enterprise Edition, Personal Edition | When making an unencrypted (Encryption: Prefer Off) connection to a server using Single Sign-On authentication, VNC Viewer can hang after the authentication phase, before displaying the remote desktop. | Use Encryption: Always On with Single Sign-On, or disable Single Sign-On. | Fixed in VNC Enterprise Edition 4.1.6 |
| 31 Mar 2005 | 24 | Windows Viewer Enterprise Edition 4.1.5, Personal Edition | After first generating a secure key when connecting to a secure server, the connection may fail with a private key error. If the connection is then re-tried using Auto Reconnect then the viewer will continue to prompt the user to generate a secure key, and to fail to connect. | When VNC Viewer prompts to reconnect, respond No, then make the connection again manually. | Fixed in VNC Enterprise Edition 4.1.6 |
| 8 Jul 2005 | 25 | Unix vncpasswd | The internal password buffer is not allocated correctly, potentially resulting in a segfault. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 26 | Windows Viewer | VNC Viewer cannot load VNC 3 configuration files that do not contain the user's password. | Edit the .vnc fileusing notepad and remove the "Password=" line. | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 27 | Windows Viewer Enterprise Edition 4.1.6 | VNC Viewer crashes if the local clipboard is changed while any AutoReconnect prompts are visible. | Avoid Copy/Cut operations until the AutoReconnect dialog has been dismissed. | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 28 | Windows Viewer Enterprise Edition 4.1.6 | VNC Viewer presents the Connection Details dialog when the listening mode viewer is closed. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 29 | Windows Viewer Enterprise Edition 4.1.6 | Creating a new connection with an existing viewer's New Connection menu item causes the original viewer to become unresponsive until the new connection is closed. | Start new connections by running a new VNC Viewer directly. | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 30 | Windows Viewer Enterprise Edition 4.1.6 | Changes made to the VNC Viewer default settings are not reflected in the Default Options dialog of listening viewers. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 31 | Windows Viewer Enterprise Edition | The Ctrl, Alt and Full-screen ticks in the F8 menu can become out of sync with the actual state of the viewer. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 32 | Windows Viewer Enterprise Edition 4.1.6 | The listening viewer port is not released until any viewer windows started using the reverse-connection mechanism have been closed, even if the listening viewer itself is closed. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 33 | Windows Viewer Enterprise Edition & Personal Edition | When connecting using a .vnc file, VNC Viewer will not offer to continue connecting if the server's identity does not match the one stored in the .vnc file. | Open the .vnc file with notepad and remove the "Identity=" line. | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 34 | Windows Viewer Enterprise Edition & Personal Edition | VNC Viewer does not respect the Preserve Aspect Ratio setting when first entering Scale to Window mode. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 35 | Windows Viewer | VNC Viewer does not restore itself to full-screen mode after having been minimized using the shell's "Show the Desktop" menu item. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 35 | Windows Server | When the RemoveWallpaper option is set, the desktop wallpaper may not be removed until after the first update has been sent to the viewer. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 36 | Unix Server | When a viewer dissappears (i.e. is switched off or physically disconnected from the network), the server may block indefinitely the next time that it tries to contact the viewer, in spite of the ClientWaitTimeMillis setting having been specified. | Run the X server with the "-dumbSched" option. | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 37 | Unix Server | The license-management directory may be created with incorrect permissions, preventing some users from being able to start desktops. | None | Fixed in VNC Enterprise Edition 4.1.7 |
| 8 Jul 2005 | 38 | Unix Server | When making a reverse connection to a viewer, the server can fail to connect with an EINTR error. | Run the X server with the "-dumbSched" option. | Fixed in VNC Enterprise Edition 4.1.7 |
| 12 Jul 2005 | 39 | Viewer | VNC Viewer will fail with the error "BufferedInStream overrun: max itemSize exceeded" if the server's cursor becomes excessively large (e.g. 64x64 pixels at 32bpp) and the viewer is configured for local cursor rendering. | Disable local cursor rendering by VNC Viewer. | Fixed in VNC Enterprise Edition 4.1.7 |
| 26 Sep 2005 | 40 | Viewer | VNC Viewer will alert the local user to reverse connections being closed before having authenticated, making it possible to "pester" a user by repeatedly connecting to their listening viewer. | Do not run VNC Viewer in listening mode. | Fixed in VNC Enterprise Edition 4.1.8 |
| 26 Sep 2005 | 41 | Windows Viewer and Server | VNC Server and listening VNC Viewers can accumulate redundant network resources over time, eventually causing them to fail. | None | Fixed in VNC Enterprise Edition 4.1.8 |
| 26 Sep 2005 | 42 | Windows Viewer | VNC Viewer fails to restore its window correctly when scrollbars are active and window is minimized using the Windows Show Desktop button. | Minimize VNC Viewer using the viewer's Minimize option. | Fixed in VNC Enterprise Edition 4.1.8 |
| 26 Sep 2005 | 43 | Windows Server | The NT Authentication tab of the VNC Server Properties dialog reverts to displaying the previous NT Authentication configuration if Apply is pressed, rather than the new configuration. | Close and re-open the NT Authentication dialog to see the new configuration. | Fixed in VNC Enterprise Edition 4.1.8 |
| 26 Sep 2005 | 44 | Unix Server | The vncserver script can hang while attempting to launch the VNC desktop if the Xvnc program lacks the suid-root flag, or when running as the root user. | Ensure that Xvnc is suid-root and run vncserver as a non-root user. | Fixed in VNC Enterprise Edition 4.1.8 |
| 16 Nov 2005 | 45 | Server version 4.1.8 | When using palettised desktop pixel formats, palette change could be missed by viewers. When using palettised desktop pixel formats with fewer than 256 colors, VNC Server could crash. | Use true-color pixel formats | Fixed in VNC Enterprise Edition 4.1.9 |
| 16 Nov 2005 | 46 | Unix Viewer and Server | vncviewer and vncconfig will not run on systems that do not have libICE and libSM available. | Install packages providing libICE and libSM | Fixed in VNC Enterprise Edition 4.1.9 |
| 16 Nov 2005 | 47 | Unix Viewer and Server | The amount of clipboard data transferred to the server by vncviewer, or to the viewer by vncconfig/Xvnc, is limited to 64Kb. | None | Fixed in VNC Enterprise Edition 4.1.9 |
| 16 Nov 2005 | 47 | Unix Server | Applications running within a VNC server desktop and which are X Session Manager aware may behave oddly or crash if that desktop was launched from within an existing desktop that was running a session manager. | Add "unset SESSION_MANAGER" as the first command in your xstartup file | Fixed in VNC Enterprise Edition 4.1.9 |
| 16 Nov 2005 | 48 | Unix Server | Multiple Gnome or KDE sessions cannot be run in separate VNC desktops under the same user account. | Add "unset SESSION_MANAGER" as the first command in your xstartup file | Fixed in VNC Enterprise Edition 4.1.9 |
| 16 Nov 2005 | 49 | Unix Server | Keyboard auto-repeat is enabled in the VNC server by default, causing undesirable effects when the server is accessed over high-latency networks. | Add "xset -r" as the first command in your xstartup file | Fixed in VNC Enterprise Edition 4.1.9 |
| 16 Nov 2005 | 50 | Server | The VNC Viewer for Java applet was signed with a certificate that has now expired. | None | Fixed in VNC Enterprise Edition 4.1.9 |
| 22 Nov 2005 | 51 | Windows Server 4.1.8 | VNC Server may truncate the VNC Viewer for Java when it is downloaded for use within a web browser, preventing it from running. | None | Fixed in VNC Enterprise Edition 4.1.9 |
| 07 Jan 2006 | 54 | Unix Server 4.1.9 | VNC Server does not provide the "copyPlanes" X call, and will terminate if an application attempts to use copyPlanes. | None | Fixed in VNC Enterprise Edition E4.2 pre-releases |
| 07 Jan 2006 | 55 | Unix Server | Some applications fail to display icons or display with the wrong colors. VNC Server can report support for several incorrect X visuals, which confuses applications that attempt to choose their own visual rather than using the default root visual setting. | None | Fixed in VNC Enterprise Edition E4.2 pre-releases |
| 12 May 2006 | 62 | VNC servers | A security vulnerability was discovered. | Upgrade to fixed version | Fixed in 4.2.3 |
If you encounter a bug with VNC Enterprise Edition, please first make sure you are running the latest release. If the bug still exists, please report it via the appropriate support channel.