![]() ![]() As it turned out this was the problem, so here is how to add that path back into your environment variables. One of the recommended solutions was to make sure a certain folder path is in your PATH environment variable. ![]() I use the Canon software CanoScan Toolbox to operate the scanner and when trying to scan I was getting the following error message: - CanoScan Toolbox - Unable to open TWAIN source Please check connection Then re-start Toolbox - OK - Searching the Internet for this problem turned up several people having the same problem and several solutions which looked like they may or may not work. I have a Canon CanoScan 4400F Scanner and the other day I was unable to get it to work. PART 3: UNINSTALL AND REINSTALL THE MFL-PRO SOFTWARE SUITE This issue may be caused by a conflict with third party anti-virus or firewall programs. ![]() Click the dropdown list to select your model if it is not already selected. ![]()
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