Edimax Technology PS-1206MFG - Manual (Page 139)

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6. When I use LPR, IPP or RAW printing, the printing jobs are not able to
print to the MFP or printer.
Check if the MFP is “Idle” but not being connected. Printing from all PC
connected to MFP server will be performed when the MFP Server is not
being connected. The printing jobs are been queuing in the Windows
spooler when there is a PC which is under connected with MFP Server.
Disable “Bi-Directional Support”. Please follow the steps below.
1. Right click the printer from “Printer and Faxes” in the Windows.
2. Select “Properties” and select “Ports”.
3. Uncheck the “Enable bidirectional support “.
Check if the MFP you are using is in the “Compatibility List” in Appendix
or contact your dealer.