When a high-volume print job fails because a Canon printer refuses to stay connected, the problem is rarely the printer hardware itself. For developers and power users supporting mixed‑OS environments, Windows and Mac printer network issues typically trace to firewall blocks, driver version mismatches, or router configuration quirks.

This guide walks through systematic diagnostics for Canon printers on modern operating systems, with specific coverage for the Canon TS3522 model.

Most Canon printers support only the 2.4 GHz frequency band. When a dual‑band router assigns the same SSID for both 2.4 GHz and 5 GHz networks, band‑steering logic can confuse the printer during connection attempts.

Beyond band‑steering conflicts, four categories cause most failures:

• Operating system permission changes
• Driver version mismatches
• Software firewalls
• Router configuration (AP isolation, client isolation)

Canon provides Wi‑Fi Connection Assistant. On Windows 11: Start > All apps > Canon Utilities. On Windows 10: Start > Canon Utilities > Wi‑Fi Connection Assistant. The tool offers Diagnose and Repair options that automatically detect and resolve common connectivity issues.

If the printer remains offline, navigate to Settings > Bluetooth & devices > Printers & scanners, right-click your Canon printer, and select "See what's printing." From the Printer menu, verify that "Use Printer Offline" is not checked. A checkmark forces Windows to ignore the network printer even when the connection is functional.

For a complete driver refresh, uninstall the Canon printer driver from Settings > Bluetooth & devices > Printers & scanners, then download the latest Windows 11 compatible package from the Canon support site and reinstall. A helpful resource for Canon printer drivers can guide you through the correct driver selection for your operating system version.

Windows Defender Firewall frequently blocks printer discovery protocols. Open Control Panel > System and Security > Windows Defender Firewall, then click "Allow an app or feature through Windows Firewall." Ensure that all Canon-related programs and "File and Printer Sharing" are enabled for Private networks. Temporarily disabling the firewall during initial setup is also an option; re-enable once the connection is confirmed.

Starting with macOS 15 (Sequoia), Apple introduced stricter local network privacy controls. Applications must request explicit permission to discover devices on the same network. If Canon software cannot locate the printer:

1. Open System Settings
2. Navigate to Privacy & Security > Local Network
3. Toggle on "Canon Office Printer Utility" or "Canon CUPS PS Printer Utility"

This setting is frequently overlooked and is the single most common reason Canon printers fail to appear on newer macOS installations.

Canon maintains CUPS printer drivers for macOS, with version 16.91.0.0 and later supporting macOS Sequoia 15 and Sonoma 14. Verify that the latest CUPS driver is installed. To add the printer manually: open System Settings > Printers & Scanners, click the + button, and select the printer listed via Bonjour Multifunction.

The Canon TS3522 presents unique challenges because it lacks a full LCD touchscreen. Connection confirmation relies entirely on button sequences and LED behavior.

To enable Easy Wireless Connect mode on the TS3522:

1. Ensure the printer is powered on
2. Press and hold the Wireless Connect button (icon shows radio waves) for approximately three seconds
3. The blue Wi-Fi indicator light should flash rapidly, indicating the printer is broadcasting its own temporary network for pairing

Critical step omitted by many users: Press the wireless connect button before running the Canon software setup application. The printer will not detect available wireless networks unless this pairing mode is activated prior to software execution.

The TS3522 uses its orange Alarm lamp to signal specific error conditions:

For a complete walkthrough of button sequences and error code meanings, detailed Canon TS3522 troubleshooting steps are available separately.

The majority of Canon printers, including the TS3522 series, do not support 5 GHz networks. When a dual‑band router uses the same SSID for both frequencies, the printer may attempt a 5 GHz connection and fail.

Fix:

• Log into your router administration interface
• Locate wireless settings
• Either disable band‑steering (labeled "Smart Connect" or "Band Steering") OR
• Assign distinct SSIDs to the 2.4 GHz and 5 GHz networks (e.g., "HomeNetwork-2.4" and "HomeNetwork-5")
• Manually connect the printer to the 2.4 GHz network using the separate SSID

Some routers employ AP isolation or client isolation features that prevent devices on the same network from communicating. If the printer successfully connects to Wi-Fi but cannot be discovered by computers, check router settings for options labeled "Client Isolation" or "AP Isolation" and disable them. This setting is common on guest networks and some mesh systems.

When USB connection is unavailable and the printer remains undiscoverable, add the printer via its IP address:

1. Obtain the printer's IP address from the router's DHCP client list or by printing a network configuration report from the printer itself
2. On Windows: Control Panel > Devices and Printers > Add a printer > "Add a printer using TCP/IP address or hostname"
3. On macOS: System Settings > Printers & Scanners > IP connection type

For environments where the printer repeatedly drops offline, assigning a static IP address often stabilizes the connection.

• Windows: After adding the printer via TCP/IP port, note the IP address. Configure your router's DHCP reservation to assign the same IP each time.
• macOS: When adding via IP, manually enter the desired static IP (outside the DHCP range).

Follow these steps in order:

1. Verify printer power and Wi-Fi indicator – Solid blue = connected; flashing = searching
2. Check operating system permissions – macOS Local Network; Windows Firewall "File and Printer Sharing"
3. Review router configuration – Separate 2.4/5 GHz SSIDs; disable band-steering
4. Run Canon diagnostic utilities – Wi-Fi Connection Assistant (Windows)
5. Reinstall drivers cleanly – Remove old driver → download latest → reinstall
6. Assign static IP – Prevents DHCP renewal drops
7. For TS3522 models – Check orange light patterns (see table above)

Network printer troubleshooting is fundamentally a process of elimination across the OS, driver, firewall, and router layers. With systematic attention to each diagnostic tier, recovery takes ten to fifteen minutes rather than hours of trial and error.