Configuring Printer Ports Printing errors can occur when the IP address of the machine has been changed, or when a printer has been added via the Windows printer folder. These errors are typically caused by incorrect printer port settings. For example, an incorrect port number or port type may have been specified. In such situations, your attempt to print fails because the document data cannot reach the machine. To fix this type of problem, configure the printer port settings on the computer. IMPORTANT To perform the following procedure, log on to your computer as a user with administrator privileges.
1. Open the printer folder. - Windows XP Professional/Server 2003
From the [Start] menu, select [Printers and Faxes]. From the [Start] menu, select [Control Panel], click [Printers and Other Hardware] and [Printers and Faxes]. From the [Start] menu, select [Control Panel] and click [Printer]. From the [Start] menu, select [Devices and Printers]. From the [Start] menu, select [Control Panel], and then double-click [Printers]. Right-click the lower-left corner of the screen and select [Control Panel]  [View devices and printers]. 2. Right-click your printer icon and click [Printer properties] (or [Properties]).
3. Click the [Ports] tab and configure the required settings.
 Adding a port If the IP address of the machine has been changed, add a new port. Adding a port is also an effective solution when an incorrect port type was selected in the Windows printer folder during the printer driver installation. (1) Click [Add Port]. (2) Select [Canon MFNP Port] in [Available port types] and click [New Port].
 (3) Click [Auto Detect], select the machine when it is detected, and click [Next].
 NOTE: If the machine is not detected - Click [Refresh]. If the problem persists, click [IP address] or [MAC address], enter the IP address or MAC address of the machine, and then click [Next].
- To check the IP address or MAC address of the machine.
(4) Click [Add] [Finish]. (5) Click [Close]. Changing the port type or number If the printing protocols or port numbers have been changed on the machine, the corresponding settings on the computer must also be configured. This change is only available for LPR or RAW ports. (1) Click [Configure Port]. (2)Click the [LPR] or [RAW] radio button in [Protocol Type], change the number in the [Port Number] text box as necessary, and then click [OK].
 4. Click [Close].
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