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ERROR: Threading issues using VNC remoting software

Symptoms

CatTools may experiences problems starting the client threads with system that are using VNC (WinVNC, TightVNC and RealVNC) remote desktop software.

You may see the following (or very similar) lines in the infolog.txt file or Info log pane:

  • Starting CatTools_Client COM object. (30 threads)*
  • Re-check of thread 1 failed. Error: Automation errorThe remote procedure call failed.
  • Error starting client threads.
  • Thread check failed on thread number 1. Will attempt restart of CatTools Client. Error: The remote server machine does not exist or is unavailable
  • Trying single threaded mode...
  • Starting CatTools_Client COM object. (1 threads)
  • Threads started. Thread count = 1
Although these errors occur, CatTools will continue running fine, but it will be running only on a single client thread so your activities may take longer to complete.

(* the number of threads will vary depending on your CatTools edition and the number of threads you have specified for your activity.)


Reason

It appears that some of these applications interrupt the windowing system and cause the client to only start one thread.


Resolve

If you need to use VNC to connect to your remote CatTools system, we recommend downloading the latest release of VNC and installing the VNC Server to your remote CatTools system and the VNC Viewer to your PC or system you are remoting from.

There is a registry change which works for some versions of VNC, so you may like to check your windows registry first.
Use RegEdit to set the "use_Deferral" setting to 0 using the following procedure:

1) Shut down the VNC Server and the CatTools Service.
2) Change the 'use_Deferral' key to DWORD '0' for "CatTools.exe", "CatTools_Client.exe" and "CatTools_Manager.exe", under HKEY_CURRENT_USER\Software\ORL\VNCHooks\Application_Prefs\
3) Restart the VNC Server and CatTools Service.

Note: you must shut down the VNC Server and CatTools Service first in order to ensure your registry changes are applied.
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