Common reasons for printer failure to connect to include network problems, driver abnormalities, service failures, and firewall restrictions. First check the physical connection to make sure that the USB is plugged in or the wireless printer is on the same Wi-Fi as the computer; secondly restart the Print Spooler service and clear the spoool folder if necessary; then update or reinstall the driver, and give priority to the official website version; finally check the firewall settings, temporarily close the antivirus software or allow the printing service to pass through the firewall.
The printer cannot be connected, and the problem usually lies in several common links. Windows prompts "Cannot connect to the printer", most of which are problems with network, driver or service settings. Turning off restarting directly is not necessarily useful, so you have to troubleshoot step by step.

Check basic connection: USB or wireless
Whether it is a USB direct connection or a wireless printer, make sure that the physical connection is fine first. Is the USB cable plugged in? Is the wireless printer powered up and connected to the same Wi-Fi?

- USB printer : Unplug it and plug it in again, try changing to a USB port.
- Wireless printer : Make sure that the printer and the computer are on the same network. Sometimes the mobile phone can connect to Wi-Fi, and the computer may be connected to the wrong one.
If you are using a shared printer (such as shared via another computer on the LAN), you must also make sure that the computer is on and the sharing permissions have not changed.
Restart Print Spooler
Print Spolver is the core service for Windows to control printing tasks, and once stuck, it will cause connection failure.

Operation steps:
- Press
Win R
to open the run window, enterservices.msc
to enter to enter - Find
Print Spooler
, right-click and select "Restart" - If the restart fails, you can try "stop" and then "start"
If the service has been automatically stopped, there may be an abnormal printing task being stuck. You can manually clear the contents of the spool folder (the path is usually C:\Windows\System32\spool\PRINTERS
).
Update or reinstall the printer driver
The driver is incompatible or the version is too old, which can also lead to the connection.
You can do this:
- Go to the device manager to find the printer device and right-click "Update Driver"
- If it doesn't work, uninstall the current printer directly and add it again:
- Settings → Bluetooth and other devices → Add a printer or scanner
- If the system does not automatically search, you can click "The printer I need is not in the list", then manually enter the IP address or select the driver
Note: It is best to download the latest drivers of the corresponding models from some brands of printers (such as HP, Canon) on the official website, rather than relying on the system's own.
Firewall or security software blocks connections
Sometimes the firewall blocks printer communication as external access, especially when the company network or using third-party antivirus software.
Suggest you:
- Temporarily turn off the firewall or antivirus software to test
- Check if any printing-related services are disabled in Control Panel → Windows Defender Firewall → Allow applications to pass the firewall
In addition, some enterprise networks will restrict printer discovery function, and you may need to manually add the printer with an IP address.
Basically these common reasons. Some problems seem complicated, but in fact they can be solved by changing the port and restarting a service. The key is not to miss details.
The above is the detailed content of Windows cannot connect to the printer. For more information, please follow other related articles on the PHP Chinese website!

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