If your printer suddenly stops working after a security update, the culprit may be your antivirus software.
This guide explains how to fix antivirus blocking printer problems while keeping your PC protected.
Why Antivirus Can Block Printer Connections
Modern antivirus programs do more than scan files.
Many suites include firewall controls, network protection, and behavior monitoring that can interfere with printer discovery, print spooler traffic, or device driver communication.
Common triggers include:
- Outbound or inbound firewall rules that block local network printing
- Real-time scanning that delays print jobs or spooler processes
- Web protection modules that treat printer utilities as suspicious
- Driver installers or firmware tools flagged as unknown applications
- Network isolation features that block discovery via Wi-Fi or Ethernet
Confirm That Antivirus Is the Cause
Before changing settings, verify that the printer issue is actually related to security software.
This avoids unnecessary troubleshooting and reduces the risk of weakening protection without reason.
Quick checks to run first
- Restart the printer, computer, and router
- Try printing from another app or another user account
- Check whether the printer works on a different device
- Disconnect from the VPN if one is active
- Temporarily connect the printer by USB, if supported
If the printer works when antivirus is disabled briefly, or if it fails only while security software is active, you likely have a conflict with the antivirus firewall or real-time protection layer.
How to Fix Antivirus Blocking Printer Problems
The safest approach is to make a targeted exception rather than turning off antivirus permanently.
The exact menus vary by product, but the steps below apply to most Windows antivirus suites, including Microsoft Defender, Norton, McAfee, Bitdefender, Avast, and Kaspersky.
1. Allow the printer app or driver in antivirus settings
Many printers install companion software for scanning, ink monitoring, or network setup.
If the security suite blocks that software, the printer may fail to communicate properly.
- Open your antivirus dashboard
- Look for exclusions, exceptions, or allowlists
- Add the printer utility, driver folder, or spooler-related executable if needed
- Save changes and restart the printer software
If you are unsure which file is blocked, check the antivirus quarantine, security history, or event log for the detected item name.
2. Check firewall rules for local printing
Network printers rely on protocols such as TCP/IP, WSD, mDNS, Bonjour, or SMB depending on the brand and setup.
A firewall can stop the computer from finding the device or sending print jobs.
- Open firewall or network protection settings in the antivirus suite
- Verify that your home or office network is marked as trusted
- Allow printer discovery on private networks
- Ensure printer-related traffic is not blocked on ports used by the device
If your printer has a vendor portal or mobile print service, you may also need to allow that application through the firewall.
3. Add printer-related folders to exclusions
Print jobs pass through the Windows Print Spooler service and related folders.
Overly aggressive scanning can delay or corrupt these processes.
Useful exclusions may include:
- C:\Windows\System32\spool\PRINTERS
- Printer vendor installation folders
- Scanning or fax utility folders
- Temporary print job directories
Only add folders you recognize and trust.
Avoid broad exclusions that include large parts of the operating system.
4. Update antivirus definitions and printer drivers
False positives are common when security definitions are outdated or when printer drivers are old.
Updating both sides often resolves the conflict immediately.
- Update antivirus signatures and program files
- Install the latest printer driver from the manufacturer
- Update the printer firmware if the vendor recommends it
- Reboot after installation to reload services
Driver updates are especially important for HP, Canon, Epson, Brother, and Xerox devices that depend on device-specific management tools.
5. Repair the Windows Print Spooler
If antivirus interference has stalled the print queue, the Print Spooler may need a reset.
This is a common fix when documents remain stuck in the queue or the printer appears offline.
- Open Services on Windows
- Locate Print Spooler
- Restart the service
- Clear queued print jobs if necessary
After restarting the spooler, try printing a test page before changing more settings.
6. Test with real-time protection paused briefly
If you need to confirm the source of the problem, pause real-time scanning for a short period and print a test page.
Do this only long enough to isolate the issue, then turn protection back on.
If printing works during the pause, the antivirus product is almost certainly the cause.
From there, use exclusions or firewall rules instead of leaving protection disabled.
Antivirus Brands and Printer Conflicts
Different security products block printer functions in different ways.
Some focus on web filtering, while others prioritize network inspection or ransomware protection.
- Microsoft Defender: usually affects printing through firewall profiles or controlled folder access
- Norton: may block device discovery or network trust rules
- McAfee: can interfere with printer setup utilities and local firewall permissions
- Bitdefender: often impacts network scanning or protected application rules
- Avast and AVG: may block printer tools through web shield or firewall components
- Kaspersky: can require application control and trusted network settings
Even when the brand differs, the repair strategy is usually the same: trust the network, allow the printer software, and keep the rest of the protection active.
Security Best Practices After the Fix
Once printing works again, keep your system secure with targeted exceptions instead of broad disabling.
- Use the smallest possible allowlist entry
- Document any exclusions you add
- Remove test changes that are no longer needed
- Keep antivirus, Windows, and printer drivers updated
- Use the manufacturer’s official software only
If the printer is shared on a work network, coordinate changes with your IT administrator so firewall and endpoint policies remain consistent across devices.
When to Contact Support
If none of the above steps resolve the issue, the conflict may involve a corrupted printer driver, a damaged security policy, or a network restriction managed by your organization.
At that point, contact your antivirus vendor or printer manufacturer and provide details such as the exact error message, printer model, operating system version, and antivirus product name.
For office environments, your IT team may need to review group policy, endpoint protection rules, or network segmentation before the printer can communicate normally.