Canon Printer Error Code 3403 — What It Means & How to Fix It

What Does This Error Mean?

Canon error 3403 means the printer could not establish a secure connection to Canon's servers. This is a security certificate or encryption handshake error. It usually happens when the printer's date and time are wrong, or when a network device is intercepting the connection.

Affected Models

Canon PIXMA TR series
Canon PIXMA TS series
Canon PIXMA MG series
Canon MAXIFY MB series

Common Causes

The printer's internal clock has drifted significantly from the correct date and time
A corporate or parental control network proxy is intercepting the printer's HTTPS connection
Canon's security certificate was recently updated and the printer's firmware is too old to accept it
The DNS server the printer is using is returning incorrect addresses for Canon's servers
The printer's firmware is outdated and does not support the current encryption standard required by Canon's servers

How to Fix It

Update the printer's firmware. On the printer, go to Settings > Web Service Setup > Web Service Connection Setup and check for firmware updates, or visit usa.canon.com/support on your computer.

Outdated firmware may not support current encryption standards. This is the most common cause of 3403.
Verify the printer's date and time are correct. On the printer, go to Settings > Device Settings > Date/Time Settings and confirm the date, time, and time zone.

SSL certificates use date-based validation. If the printer thinks it is years in the past, it will reject valid certificates.
Change the DNS to Google's public DNS. Go to Settings > LAN Settings > TCP/IP Settings > DNS Server and set Primary DNS to 8.8.8.8 and Secondary DNS to 8.8.4.4.

A DNS server that returns wrong addresses for Canon's servers can trigger SSL errors.
If you are on a business or school network, check if there is a proxy or SSL inspection device on the network. These intercept HTTPS traffic and can cause certificate errors.

Try connecting the printer to your home Wi-Fi or mobile hotspot to test if the network itself is causing the issue.
Reset the printer's network settings and set it up again. Go to Settings > Device Settings > Reset Settings > Reset LAN Settings.

A fresh network configuration removes any corrupted settings that might be contributing to the SSL failure.

When to Call a Professional

Error 3403 is a software or network security configuration issue. No hardware repair is needed. If the error persists after updating firmware and checking your network, contact Canon Support at usa.canon.com/support.

Frequently Asked Questions

What is an SSL certificate error in simple terms?

When your printer connects to Canon's website, it checks a digital ID (the SSL certificate) to verify it is really Canon's server. If the date is wrong on the printer, or the certificate is not one the printer recognizes, the connection is refused for security. It is like a security guard refusing to let someone in because their ID card shows an expired date.

Will error 3403 affect basic printing from my computer?

No. Local printing via USB or Wi-Fi does not involve Canon's servers. Error 3403 only affects cloud-based features like remote printing and online Canon services. You can continue printing normally at home while you troubleshoot this error.

How do I check my printer's firmware version?

On the printer, go to Settings > About This Printer or Information and look for the firmware or system version number. You can also print a configuration page from the printer's settings menu — the firmware version is listed there. Compare this to the latest version on Canon's support website for your model.