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Stan7777
1st Topic

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4 Messages

Sunday, August 4th, 2024 9:44 PM

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Outlook can not verify STMP cirt

I am replacing my wife’s PC with a new windows 11pro PC with a local logon. I loaded Microsoft office/outlook from my Microsoft account. Set it up for her existing email account. Pop/Smtp. Works sending and receiving email with one small exception. Each time I open outlook and attempt to send email I get the following popup. 
“Internet Security Warning. The server you are connected to is using a security certificate that cannot be verified. Target principal name is incorrect. SMTP.Comcast.Net  Do you want to continue using server.” I check yes and it works until the next time I start Outlook, and I must do it again.

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Updated 

9 months ago

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XfinityAlfonso

Official Employee

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1.6K Messages

9 months ago

Hey there Stan7777 this error occurs when Microsoft perceives that the server name doesn't match. This is not a critical error, but it will likely keep appearing. As long as your server settings reflect the following you are A-OK. 

 

- Incoming Mail Server Name: imap.comcast.net

 

- Incoming Mail Server Port Number: 993 with SSL ON


-If the Mail Client lets you select an authentication method, choose STARTTLS.

 

-If Needed: 143 with SSL ON


-Outgoing Mail Server Name: smtp.comcast.net

 

-Outgoing Mail Server Port Number: 587 (SMTP)

 

-If Needed: 465 (SMTPS)

 

-Encryption: TLS (use SSL if TLS isn't shown.)

 

-Authentication: Type in your Comcast.net email address

 

4

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Stan7777

Visitor

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4 Messages

Yes, this works with no error, but I want a pop account with PSTs. I have other comcast pop accounts that work. Wifes current and my pc win 10 PC work with pop settings, but new win 11 pro has error describe above. 

9 months ago

0

CC_Tony

Retired Employee

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1.4K Messages

@Stan7777 Are you using Port 995 for the Incoming Mail Server? Also, are you using SSL encryption? These are our recommended settings for POP.

9 months ago

0

Stan7777

Visitor

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4 Messages

Yes, to both. I have tried several recommended settings. Setting work on my other WIN 10 PCs. It works great after I except using the unverified certification. In general, does your pop server work with outlook on windows 11 pro. I have tied turning virus protection (defender) off and that does not help. I do not want my fife to have to do this every time she starts outlook.

9 months ago

0

XfinityBillie

Official Employee

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3.3K Messages

@Stan777 Can you tell me what version of Outlook you are running on the new PC?

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

9 months ago

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user_g27j35

Regular Visitor

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5 Messages

9 months ago

I have the exact same problem with a new Windows 11 PC.   I have Office 365, and I'm using Outlook Classic because I heavily depend on pst files.   The default Outlook installation was "New Outlook" which doesn't support psts, but I was able to do a new installation of Outlook Classic from the Microsoft site.   I'm using POP3  with mail.comcast.net port 995 with SSL as the incoming server and SMTP.comcast.net port 465 with SSL as the outgoing server.  The warning doesn't say which is the problem, but it says the certificate was issued to imap.email.comcast.net.   I have the same mail setup on three Windows 10 PCs that have had Outlook 365 installed on them for a while, and they don't have the problem so far.

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Stan7777

Visitor

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4 Messages

Robert at xtechs computer, [Edited: "Personal Information"] solved my problem. I think he worked with new profile, not sure. look at the xfinity responses. xfinity help was lame

(edited)

9 months ago

0

pmartin123

Visitor

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7 Messages

I have the same issue.  Only started about a week ago when I was travelling and accessing email from my hotel room.  I'm also using POP and the certificate shows Imap.  My certificate is from Bit Defender, I actually completed deleted the certificate from my Windows laptop but the message keeps popping up every time I run Outlook.  What was the solution using a new user profile?  I'll try that if it works

9 months ago

0

XfinityGabby

Official Employee

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1.5K Messages

Hello, @pmartin123. Thanks for reaching our team regarding the email concerns. Have you attempted to login to our website to check if you're experiencing the issue there as well or is it only happening while running Outlook?

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
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

9 months ago

0

pmartin123

Visitor

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7 Messages

I just checked and do not get the error accessing email via the xfinity.com web interface.  Additional info, I'm on Windows 11 (latest update), I have all the email ports and security settings correct, and I'm running outlook 2019 installed on my laptop, not Office365.

9 months ago

0

XfinityGabby

Official Employee

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1.5K Messages

Thanks for the additional information, @pmartin123. Have you attempted to switch from port 465 to port 587? Our guidance on port settings outlines 2 ports as options for the configuration of outgoing mail to be set on. You can see the step by step instructions on how to do that here.

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
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

9 months ago

0

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