Got a Xerox WorkCentre 4150 here, and there is a "Unknown" job that is displayed in the Queue on the printer. However I cannot remove or delete this job at all. I have also logged into the printer from it's IP address to access the internet services, and cannot remove it from there either. Anyone experience this on this printer type before?
Can you tell if the "Unknown" job in the queue has a .XST file extension on it? If it does, this may be the issue. A .XST file is a Job Log file that is created on Scan to File (Network Scanning) jobs. This Job Log file can be turned off to avoid this issue. If the job in the job queue has a different file extension then please perform the following:
Following the above steps will tell you what the printer is looking for to complete this job. Once you know what is needed, you should be able to resolve the problem.