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Phizwiz
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Sunday, October 27th, 2024 5:12 PM

Blacklist error message 0X800CC92

I have used Outlook on Microsoft 365 for more than a year, to access two email accounts that Xfinity has graciously grandfathered in for me. Within the past two months, my downloads to Outlook are almost invariably blocked by Comcast with a Blacklisted message and an error code of 0X800CC92. Occasionally, everything works as it should, but this has been a rarity. With one exception, I have been able to access Comcast email directly using the same passwords as in Outlook, but when I tried to create a new Outlook profile as recommended by Microsoft, it failed in roughly the same manner as the email downloading failed.

I do get email on a gmail account both directly and from one Comcast account in which I set a forwarding address. While this email uses IMAP and the two Comcast accounts are POP3, my wife has the same email problems and all of hers are IMAP, yet only the gmail seems to work regularly. Could this simply be a port problem, and if so, what are the latest advised port and security settings for POP3 and IMAP?

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XfinityDemitrius

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2 months ago

Hey @Phizwiz, Thank you for visiting our official Xfinity Forums Community support page. We greatly appreciate you taking the time to share your experience regarding the Xfinity Email service. I would be more than happy to offer my assistance looking into this further for you.

 

You can find out recommended Xfinity Email port settings by visiting our 'How To Set Up Your Xfinity Email Address With an Email Program' support page. Also, be sure to verify and check that you have third-party access enabled by going through the following steps on our 'Turn your access to third-party email programs on or off in Xfinity Email' support page.

 

Do you currently have access without issue when attempting to access our Xfinity Email service through our official web portal?

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Phizwiz

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@XfinityDemitrius​ Thanks. The third party access was set properly. I checked this morning, again.  I'll go to the set up link, which I never did before because I thought, based on Outlook verbiage, it only required me to match what worked before when I was using Windows Live Mail. As all was good for a year and a half, I just kept going. More later after I look at the link.

Apart from one time, I've been able to access Xfinity Email service through the official web portal. So, I suspect the problem is a fight between my Outlook client and the Xfinity email system/server.

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2 months ago

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XfinityAmandaB

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Phizwiz If you could and keep us updated. There are a few places that a password is needed and we have seen in the past the password needs to be updated or readded, but it sounds like it is having some issues authenticating.

 

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2 months ago

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Phizwiz

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@XfinityAmandaB​ HI Amanda,

Yes, the error is an authentication error, OR, something with the Blacklist went bonkers. Happens from time to time. I've been trying to get Microsoft Support to see if my version of Outlook might be to blame, but that's still a work in progress. Since everything has worked for more than a year, I have to think that some protocol changed. When I've tried to set up a new Outlook profile to essentially reinitialize my Comcast connections, I was asked to set up an IMAP connection, with no apparent POP3 option. As my current Outlook accounts for Comcast are POP3, I wonder if there's some problem with POP3 now. On the other hand, my wife has all the same problems with Outlook, and she uses IMAP exclusively.

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2 months ago

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XfinityLinda

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@Phizwiz Thanks for sharing. Please update your results here in an effort to help our community. Much appreciated!

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2 months ago

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Again

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@Phizwiz 

Could you please check your settings to see if your Authentication method is Normal password or OAuth2?  It should be Normal password.

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2 months ago

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Phizwiz

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2 months ago

Has Xfinity stopped supporting email downloads from Classical Outlook?

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XfinityAmandaB

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Phizwiz No we have stopped supporting Classic Outlook in fact we have our How To Set Up Your Xfinity Email Address With an Email Program page that has a link right to Microsoft Support that shows Outlook classic steps. 

 

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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
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2 months ago

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Phizwiz

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@XfinityAmandaB​ Hi Amanda,

Good to see that, but it seems that IMAP shows up in funny ways when I try to access my Comcast/Xfinity email. When I looked into setting up an Xfinity Email Address at Comcast, I don't see the POP3 option. Maybe I missed it. I thought about removing my existing Comcast accounts in Outlook, NOT in Comcast, but I'm not sure what gets saved or how to save past important emails. This might be more difficult if I use IMAP in a new account, since I've been manually discarding emails on the Xfinity site after having read them there because the downloads failed. To add to the confusion, both my wife and I were able to download emails using Outlook yesterday, but NOT today.

In addition to the popup that asks for password verification but ignores whatever choices I make, I've just started to receive a popup which emerges the first time I try to download in a session. This popup states INTERNET SECURITY WARNING and asks if I want to continue to use this server. It includes the message that the target principal name is incorrect. The certificate points to imap.email.comcast.net, which doesn't seem like what I'd want to use for a POP3 connection. It was from COMODO CA, which apparently is doing business as Sectigo. Totally beyond my ken.

This apparent focus on IMAP is why I asked if Classic Outlook was still supported. I didn't ask about whether POP3 is still supported because my wife has the same problems with the Outlook - Comcast connection even though she's using IMAP exclusively. And, even though my POP3 connections to Comcast fail most of the time, the fact that they work without problems intermittently makes setup issues not very likely.

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2 months ago

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XfinityAmandaB

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Phizwiz It sounds like there may be a password field not filled out in one of the settings options with the security warning. We do still support POP mail but recommend the IMAP for syncing options on more than one device but you can still use POP as well. I may have missed it and I apologize but what type of device are you trying to set email up on using the Classic Outlook? 

 

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2 months ago

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Phizwiz

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@XfinityAmandaB​ Hi Amanda,

I have used Classic Outlook on my desktop running Windows 10 for at least a year and a half. It came to me through Windows 365 to which I have a live subscription. Until a month or two ago, everything worked fine. So, I can't see where or how an intermittent connection problem which has become dominant, could arise from a password field not being filled out. Of course, my not seeing how this could occur doesn't mean there isn't some way where a password field is missing, but I doubt it.

Yesterday, both my wife's and my email access to Comcast through Outlook worked every time. Today, we're back to being rejected. I get the wrong server message followed by the Blacklist message that pops for each POP3 account. My wife, using only IMAP connections, only gets the Blacklist message. Our routers are from eero via our ISP, and they haven't seen anything like this.

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2 months ago

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XfinityBenjaminM

Official Employee

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1.7K Messages

 

Phizwiz Have you spoken with our Customer Security Assurance Team regarding the blacklist? They may be able to see something on the backend that is limiting your access and get that resolved. Their contact number is 1-888-565-4329.

 

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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
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Was your question answered? Please, mark a reply as the Accepted Answer.tick

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2 months ago

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