When a printer on your network stops printing on both sides of the paper, the duplex unit may be missing or not recognized by Windows 11. This often happens after a printer driver update, a network change, or when a new printer is added to the print server. The duplex unit is a hardware component that enables automatic two-sided printing. If Windows 11 does not detect it, the printer will only print single-sided pages. This article shows you how to check the duplex unit status in Print Server Properties and restore duplex printing.
Key Takeaways: Detecting a Missing Duplex Unit in Windows 11
- Print Server Properties > Drivers tab > Properties > Device Settings: Shows the duplex unit status and allows you to change the duplex configuration.
- Settings > Bluetooth & devices > Printers & scanners > Print server properties: The path to open Print Server Properties from the Settings app.
- Installed duplex unit option: Must be set to Installed in the printer driver settings for duplex printing to work.
Why Windows 11 Does Not Detect the Duplex Unit
The duplex unit is a physical component inside the printer that flips the paper for two-sided printing. Windows 11 communicates with the printer through a driver. The driver contains a device settings section that tells the operating system what hardware is available. If the driver is outdated, corrupted, or configured incorrectly, the duplex unit may appear as Not Installed or Missing.
Common causes include:
- A printer driver update that resets the device settings to defaults
- Installing a printer using a basic driver that does not support duplex
- Network connectivity issues that prevent the printer from reporting its capabilities
- Manually changing the driver to one that does not match the printer model
The Print Server Properties tool in Windows 11 provides a central location to view and modify driver settings for all printers on the system. This tool is part of the legacy Control Panel interface and is still available in Windows 11.
Steps to Check Duplex Unit Status in Print Server Properties
Follow these steps to open Print Server Properties and verify the duplex unit configuration for your printer.
- Open Print Server Properties
Press Windows key + R to open the Run dialog. Type printmanagement.msc and press Enter. This opens Print Management. Alternatively, go to Settings > Bluetooth & devices > Printers & scanners, then click Print server properties at the top of the page. - Select the Drivers tab
In the Print Server Properties window, click the Drivers tab. A list of all installed printer drivers appears. Locate the driver for your printer. If you have multiple printers, look for the driver name that matches your printer model. - Open driver properties
Select the driver and click Properties. A new window opens with tabs for General, Device Settings, and other options. - Check the Device Settings tab
Click the Device Settings tab. Scroll down to the Installable Options section. Look for Duplex Unit or Duplexer. The value should be set to Installed. If it shows Not Installed, this is why duplex printing is not working. - Change the duplex unit status
Click the dropdown menu next to Duplex Unit. Select Installed. Click Apply and then OK to save the change. Close the Print Server Properties window. - Test duplex printing
Open any document, press Ctrl + P to open Print. Select your printer. Click Properties or Preferences. Look for a Duplex or Two-Sided option. Select it and print a test page.
Alternative Method Using Control Panel
If you prefer the classic Control Panel, use this path:
- Open Control Panel
Press Windows key + R, type control, and press Enter. - Navigate to Devices and Printers
Click View devices and printers under Hardware and Sound. - Open Print Server Properties
Right-click any empty area in the Devices and Printers window. Select Print server properties from the context menu. This opens the same window as the Settings method.
If the Duplex Unit Option Is Missing Entirely
Sometimes the Device Settings tab does not show a Duplex Unit option at all. This happens when the installed driver does not support duplex configuration. The driver may be a basic or universal driver that Windows 11 selected automatically.
Install the Correct Manufacturer Driver
To fix this, download and install the full driver package from your printer manufacturer’s website. For example, if you use a Brother printer, visit the Brother support site and download the full driver package for your model and Windows 11. After installation, repeat the steps in the previous section to verify the duplex unit is set to Installed.
Remove and Re-add the Printer
If updating the driver does not work, remove the printer from Windows 11 and add it again using the correct driver.
- Remove the printer
Go to Settings > Bluetooth & devices > Printers & scanners. Click the printer name. Click Remove. - Add the printer manually
Click Add device. When Windows 11 finds your printer, click Add manually at the bottom. Select Add a printer using an IP address or hostname if it is a network printer. Choose the correct driver from the list or click Have Disk to use the downloaded driver. - Verify duplex settings
After the printer is added, open Print Server Properties again and check the Device Settings tab for the duplex unit.
Common Issues and Related Failures
Duplex Printing Works Intermittently
If duplex printing works sometimes but not always, the issue may be a network timeout. Printers that are connected over Wi-Fi or Ethernet may lose communication with the print server. Check the printer’s network connection and ensure it has a static IP address to prevent disconnections.
Printer Shows Duplex Unit Installed But Still Prints Single-Sided
This can happen when the application you are printing from overrides the printer settings. For example, Microsoft Word has its own duplex setting. In Word, go to File > Print, click Printer Properties, and set Duplex to Long Edge or Short Edge.
Duplex Unit Option Greyed Out in Print Server Properties
A greyed-out option means the driver does not support changing the duplex unit setting. This is common with generic or Microsoft-provided drivers. Download the manufacturer-specific driver to enable this option.
| Item | Print Server Properties Method | Settings App Method |
|---|---|---|
| Access path | Control Panel > Devices and Printers > Print server properties | Settings > Bluetooth & devices > Printers & scanners > Print server properties |
| Ease of access | Requires right-clicking empty area in Devices and Printers | Direct link at top of Printers & scanners page |
| Driver version visibility | Shows driver name and version in Drivers tab | Same Print Server Properties window, identical functionality |
| Best for | Users familiar with Control Panel | Users who prefer the modern Settings interface |
Both methods open the exact same Print Server Properties dialog. The Settings app provides a faster way to reach it on Windows 11.
Now you can detect and fix a missing duplex unit in Print Server Properties on Windows 11. Start by checking the Device Settings tab under the printer driver properties. If the duplex unit is set to Not Installed, change it to Installed. If the option is missing, install the correct driver from your printer manufacturer. For persistent issues, remove and re-add the printer using the full driver package. After making these changes, run a duplex test print to confirm the fix. As a final step, set the printer to use a static IP address to prevent future network-related duplex failures.