Canon scanner – unable to open twain source. unable to open twain source please check connection then re-start toolbox. the problem is that the twain drivers are not within the system variables path. what i do first is open the control panel. next i click system and security.. If not, go to c:windowstwain_32, and see if you have a folder similar to cnql60 they copy the full path of the folder into clipboard click windows' start button, then search "environment", then. Tried uninstallin and installin canon scanner drivers..nothing works..still seeing unable to select twian source.. so i tried an alternative..here we go...
Unable to open twain source its been working well on my new dell xps8700 running windows 10 for over 6 months. suddenly i get "unable to open twain source please check connection then re-start toolbox" unplugging and plugging the connection the computer gives the little beeps acknowledging the connection.. This looks to be a tricky one. i have two pc's running windows 7 pro with sp2. one can detect and run canon toolbox for scanning, the other does not.. Rrr_news, thanks for the reply, no network involved and have dowloaded drivers, will try to reinstall them again, advice on canon site indicates a manual install of the twain-driver may be the answer..
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