PIXMA TR8620a Unable to access UI

Scottie2000 — Tue, 20 Jan 2026 14:36:11 GMT

TR8620a is not responding to the serial number, 7654321, or canon. Unable to gain access to user interface. Lost valid certificate with reset and printer will not allow access. Any other ideas on fixing "invalid certificate"?

Re: 8620a printer access to UI

Stephen — Mon, 19 Jan 2026 19:50:23 GMT

That 'invalid certificate' error usually pops up when the browser doesn't trust the printer's new security ID after a reset—it's basically a security mismatch. Since the serial number isn't letting you back in to update those settings, our support team can help you bypass that lockout over the phone.

You can reach them at 1-800-OK-CANON (800-652-2666) for real-time help.

topic PIXMA TR8620a Unable to access UI in Printer Software & Networking

PIXMA TR8620a Unable to access UI

Re: 8620a printer access to UI