Visitor

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2 Messages

Monday, November 17th, 2025 8:01 PM

comcast.net

My Microsoft Outlook 365 could not download nor sent email through comcast.net. Was working this morning.  Now each time I tried to sent an email it gaves me an error that it could not connect to the server.

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Visitor

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2 Messages

4 days ago

Here is the error code that popup: resomta-h2p-554996.sys.comcast.net resomta-h2p-554996.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available

Error Code: -17099

Official Employee

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2.1K Messages

 

user_1cfbnw, thank you for reaching out to Xfinity Support. I'm not finding anything on this error code. Are you still having trouble? 

 

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Gold Problem Solver

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26.9K Messages

1 day ago

... Excessive failed authentication ...

This usually means that one or more of your devices is repeatably trying to log in to the mail system, but is supplying an incorrect ID or password. Eventually the system will lock you out for a period of time. The Comcast Security Assurance group (see https://spa.xfinity.com/contact-us) may or may not be willing and able to help you.

If not, you'll have to locate the troublemaker yourself. https://forums.xfinity.com/conversations/email/possible-solution-for-unable-to-connect-to-email-from-apple-maybe-other-devices-after-changing-comcast-password/65a1a8fbf961c6163a367c6f describes one approach.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

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