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WNM4
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Friday, September 15th, 2023 3:07 AM

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Sending error 0x800CCC0F using Outlook/Microsoft 365 from both desktop and laptop machines

This inability to send emails has been happening on both my laptop and desktop machines for two days now.  The POP3 interface is used. I can still receive emails.  The error 0x800CCC0F "The connection to the server was interrupted" occurs within about 20 seconds of attempting to send an email.  Both systems use the same email settings.

  • Outgoing mail server is: smtp.comcast.net
  • My outgoing server (SMTP) requires authentication: checked
  • Log on using:  User Name / Password (checked multiple times for correctness)
  • Remember password: checked
  • Require Secure Password Authentication (SPA): unchecked
  • Log on to incoming mail server before sending mail: not selected
  • Outgoing server (SMTP): 465
  • Use the following type of encrypted connection: SSL/TLS
  • Server Timeouts: 2 minutes

Both systems are running Windows 10 Pro 22H2. Xfinity is the common factor between the two systems. What's causing this and what will it take to get it fixed.

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1 year ago

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Accepted Solution

WNM4

New Poster

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12 Messages

1 year ago

It looks as though the final resolution of this was buried several layers deep in this discussion. Here is a link to that message.

https://forums.xfinity.com/conversations/email/sending-error-0x800ccc0f-using-outlookmicrosoft-365-from-both-desktop-and-laptop-machines/6503ca7ca4ef97258666243d?commentId=6508c6a1baecdd4ece06537f&replyId=650b7b58ea929f0d57dcbaa4

In a nutshell the Comcast mail server's processing of passwords for send-mail requests has started rejecting previously acceptable passwords.  My fix was to change my Comcast password to use "less special 'special' characters". @XfinityAlex who helped get to the bottom of this said with regards to the problem: "Yes, we recently changed the backend for performing authentication. It seems this is an issue that they [the Comcast team responsible for this change] need to resolve."

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WNM4

New Poster

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12 Messages

1 year ago

I just spent about three hours in a remote-access session with Microsoft 365 support and we have concluded that the problem lies with comcast. The Outlook email profile and account was setup from scratch several times, both as a POP3 and IMAP account and both experienced the exact same failure when trying to send a message. We then took my wife's comcast email account settings and used them to create a profile/account and it worked fine.  The problem is NOT with Outlook or the computers; it is with comcast's handling of my account.  FWIW, I can use the comcast web mail interface to access my email and it also works fine if I need to send an email. 

(edited)

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XfinityJeniece

Official Employee

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2.4K Messages

Hey there, @WNM4, thanks for reaching out through Xfinity Forums regarding your email account. We would be happy to help with troubleshooting! I would like to take a look at your account. 

Please send us a direct message with your name and service address, so we can assist you further. To send us a Direct Message, you will need to sign in to the Forums if you are not. Then you will need to locate and click on the "Direct Message" icon located in the upper right corner of this page. Next, click the "New Message" (paper & pencil) icon and type "Xfinity Support" in the to line, and select "Xfinity Support" from the drop-down list. You can proceed to type your message in the text area near the bottom, and press enter to send the message. Please let me know if you have any questions.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

1 year ago

0

frustrated_user34

8 Messages

I'm having the exact same issue!  Began overnight - email worked fine on the 13th and without changing any computer setting, starting on the 14th began receiving sending comcast error 0x800CCC0F using Outlook/Microsoft 365 from laptop and on iPhone. I have 2 Comcast emails and having the same problem. I can send/receive other emails (gmail, work, etc). I can send/receive comcast emails on a Browser, but not through Outlook.

I have now spent 10-12 hours trying different things and reading a lot on the internet.  Nothing has changed in 3 days.

my summary

email settings are the same as above.
verified that permission given for using 3rd party app https://www.xfinity.com/support/articles/third-party-email-access
I've turned off firewall and virus protection-no change
I uninstalled the last Windows update - no change
and probably other things I'm forgetting

First call to Xfinity.  Basic troubleshooting and then ran out of options "we'll call you back in 4 hours".  No call back.  4 hours later, I called again.

2nd call to Xfinity.  More basic troubleshooping and then ran out of options. Total call length 1 hr 16 minutes. Got a case # "we'll call you back in 72 hours".  No call back.  71 hours later, I called again.

3rd call to Xfinity.  After 4 calls, I finally reached tech support (first 3 calls I was erronously routed for a phone explanation on how to set my default language-TV?). Did more basic troubleshooting. I asked if my email was being blocked due to spam - Xfinity hasn't responded. total call length 53 minutes. I'm supposed to get a call back in an hour. 

1 year ago

0

XfinityAmira

Official Employee

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3.8K Messages

Hello @frustrated_user34! We appreciate you taking the time to reach out to our Team on Forums regarding this email issue. I am sorry to hear about the issues you have experienced trying to work with us in getting this investigated. 

 

I also apologize for any inconvenience or frustration this has caused you thus far. My team would be more than happy to further assist you. Please send us a Direct Message. Here are the detailed steps to direct message us: 
 • Click "Sign In" if necessary
 • Click the "Direct Message icon” (upper right corner of this page)
 • Click the "New message" (pencil and paper) icon
 • Type "Xfinity Support" in the To line and select "Xfinity Support" from the drop-down list
 • Type your message in the text area near the bottom of the window
 • Press Enter to send your message

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

1 year ago

0

frustrated_user34

8 Messages

1 year ago

hey @WNM4, wondering if you could share your solution?

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WNM4

New Poster

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12 Messages

No solution yet.  I've been told that my issue has had an "advanced repair ticket" created for it but I've seen nothing further beyond that.  

1 year ago

0

frustrated_user34

8 Messages

thanks.  Also I have an "advanced repair ticket" with Xfinity. 

1 year ago

0

Again

Expert

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31K Messages

1 year ago

@WNM4 @frustrated_user34 

Neither of you have given us the complete error message that you're getting; you stop at 0x800CCC0F.  Does this look like the whole message:

Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).  The server responded: TLS 1.0 and 1.1 are not supported. Please upgrade/update your client to support TLS 1.2. Visit https://aka.ms/popimap_tls.'

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