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Firefox won't let me open "Xfinityconnect.email.comcast.net"

  • 5 replies
  • 1 has this problem
  • 15 views
  • Last reply by cor-el

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For the last 3 days every time I try to access my email account, "xfinityconnect.email.comcast.net", a warning comes up saying Firefox won't let me connect. "Warning: Potential Security Risk Ahead". I have scanned my computer and removed any threats, viruses, malware etc. but the warning continues to block my mail program. Help!

Attached screenshots

All Replies (5)

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Press the 'Advanced' button. What does it say?

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The Advanced button says "SEC_ERROR_UNKNOWN_ISSUER"

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Please ignore the spam reply about third-party support you may have received earlier.


You can check if more detail is available about the issuer of the certificate.

  • click the "Advanced" button show more detail
  • click the blue error text (SEC_ERROR_UNKNOWN_ISSUER) to show the certificate chain
  • click "Copy text to clipboard" and paste the base64 certificate chain text in a reply
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https://xfinityconnect.email.comcast.net/

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: false

HTTP Public Key Pinning: false

Certificate chain:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Modified by cor-el

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This certificate is issued by your Avast security software.

See this article for more detail.