Troubleshooting

VNC doesn't seem to work properly with Windows XP: VNC will work with Windows XP provided that Fast User Switching and Remote Administration are not used. Windows XP uses the Terminal Services system to implement Fast User Switching and Remote Administration. This is not compatible with releases of VNC prior to VNC Open version 4.1 and Enterprise Edition version 4.1.3. These versions of VNC include a workaround to ensure that session zero is always available, and a more complete solution will be included in a future release.
VNC causes my Windows NT/2000/XP machine to blue screen: Windows NT Version 4 has bugs in the API which is used by VNC. You must have service pack 3 or higher installed to avoid problems.
On Windows 2000/XP there are reports that blue screens occur as a result of having Microsoft Hotfix installed, with or without VNC installed.
VNC does not install any system level hooks or driver software. Consequently it cannot cause machines to crash except by by exposing bugs in the undelying operating system and device drivers. If it appears that VNC causes your machine to crash, check that you have the latest service packs, graphics drivers and network drivers installed for your system.
My computer uses roaming profiles, and with VNC installed the profiles are sometimes not saved back to the server. It can take a very long time to log out.: Versions of VNC prior to 3.3.6 have a bug that can cause this behaviour. Additionally we have had reports that Windows 2000 machines with Hotfix Q329170 installed exhibit the same behaviour, with or without VNC installed.