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5. Troubleshooting
Refer to the Linux User’s Guide that came with your computer for further information on Linux error messages.
“Cannot open port device file”
error message appears when
printing a document.
Avoid changing print job parameters (via LPR GUI, for example) while a print job is in progress. Known versions of CUPS server break
the print job whenever print options are changed and then try to restart the job from the beginning. Since Unified Linux Driver locks
the mfp port while printing, the abrupt termination of the driver keeps the port locked and unavailable for subsequent print jobs. If
this situation occurs, try to release the mfp port by selecting Release port in Port configuration window.
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