topic Re: imageCLASS MF743Cdw SMTP Authentication Error 839 in Office Printers

imageCLASS MF743Cdw SMTP Authentication Error 839

Syrissa — Fri, 04 Oct 2024 15:40:17 GMT

Hello,

I've dealt with this error on and off over the last 3 years. I know how to fix it but for some reason today, it's not working. Typically I go into the UI Remote port and have to re-enter my password. For some reason, this no longer fixes my error. I'm not sure where to go from here. I've been on hold with canon support for over an hour and no one will pick up the phone and help me. This is really exhausting. Any advice would be much appreciated!

Re: SMTP Authentication Error 839

Danny — Fri, 04 Oct 2024 15:36:38 GMT

Thanks for joining the conversation, Syrissa!

So that the Community can help you better, we need to know exactly which Canon printer model you're using. That, and any other details you'd like to give will help the Community better understand your issue!

If this is a time-sensitive matter, click HERE search our knowledge base or find additional support options HERE.

Thanks and have a great day!

Re: SMTP Authentication Error 839

Syrissa — Fri, 04 Oct 2024 15:39:23 GMT

Hi Danny,

My apologies.. I guess that would be helpful. I am using a Canon ImageClass mf743cdw.

Re: imageCLASS MF743Cdw SMTP Authentication Error 839

canonkfs — Sat, 05 Oct 2024 02:21:45 GMT

Hi - I am encountering the same issue and I think it may have to be with Google and MS Office365 requiring updated signing (no longer supporting "less secure apps"). See link below for Microsoft's announcement.

Modern Authentication Methods now needed to continue syncing Outlook Email in non-Microsoft email apps - Microsoft Support

Are there any plans for this printer to support Oauth2? Same product as Syrissa (MF743CDW)

Re: imageCLASS MF743Cdw SMTP Authentication Error 839

dave351 — Fri, 07 Feb 2025 15:26:00 GMT

Is there an update on this issue? I have the same model and am getting the same error.