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Javablood
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18 Messages

10/07/2026 1:32 AM

Internet Security Warning re security certificate cannot be verified

Why do I keep getting this warning? Is it my server provider or Xfinity?

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11 days ago

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XfinitySeth

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16 days ago

Thanks for connecting with us in our community Javablood 🙌 Whenever you see that specific internet warning you're reporting, it is usually website specific meaning DNSSEC validation for the site failed or the DNS records (including those pointing to SSL certificates) may have been spoofed or tampered with. Are you seeing this warning on multiple websites or only one?

 

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Javablood

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@XfinitySeth​ Thank you for your response. It only comes up when I am using Outlook on my desktop with MS 365. I keep using the server, yet I will not install the certificate! So, is it something with the Xfinity server or what?

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16 days ago

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XfinityEricB

Official Employee

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3.8K Messages

 

Javablood The server may just be blocking your IP for some reason. Have you contacted the website admin to request a reverse traceroute to see if that is the case to get it unblocked?

 

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.
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16 days ago

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Javablood

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I contacted Xfinity by phone & it was useless! :-( So now what? How would I contact the website admin? And is it the Xfinity website admin? Thank you.

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16 days ago

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XfinityAmira

Official Employee

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5.1K Messages

@Javablood The website admin would be Outlook, whom you would reach out to and request a reverse traceroute from. Also, for troubleshooting purposes, have you tried manually rebooting your modem to see if that helps correct this on your end?

 

To manually reboot, unplug the power cable from the back of the modem, wait 10-15 secs, plug the power cable back in, and allow 10 mins or less for the modem to reboot. 

(edited)

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 as Best Answer.tick

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16 days ago

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Javablood

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That is not the issue. Why is it a Sectigo issued certificate using imap.email.comcast.net as the certification path?

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11 days ago

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