Since Import is a user based app, there is no server like behavior in as much as it can automatically retry a failed import.
Running import jobs on the DocuWare server is an immediate source of conflict. Both the Desktop app and the server begin to compete for resources (particularly OCR). Usually the end result is poor performance all round. I would usually recommend importing from a workstation. It is possible that a resource conflict is causing import to fail to get the responses required resulting in the file cabinet access error. It could also be that the source of the problem is Job Server.
If not already configured, I would change the Desktop Apps to import using Platform rather than Job Server. This will not only be quicker but may result in better resource usage.
To change Desktop to use Platform, open the DocuWare.DesktopService.exe.config file (in the \DocuWare\Desktop folder).
Find this line (about 2/3rds of the way down the file):
Change the word "Automatic" to "StoreViaPlatformClient" like this:
Save the file and restart the Desktop Service.
Senior Director Support Americas