bobby999999's profile

Regular Visitor


9 Messages

Wednesday, February 21st, 2024 1:58 PM

jumbo frames breaks imap and also xfinity web app

If I enable jumbo frames (MTU=9014) imap stops working and the xfinity web 'app bar' at the top of never comes up preventing use of web email.  I've seen historic complaints 2-3 years ago confirming this.  Can anyone speak to how to get this resolved?  My LAN MTU should have nothing to do with Xfinity - it gets broken up at the firewall so what's up with this?


Official Employee


1K Messages

5 months ago



We do not support modifying or usage of jumbo framing through our residential services. You can reach out to our Comcast Business support team to learn if our Ethernet Private Line service or Business Internet is something you would be interested in and support your needs. Our Comcast Business team can be reached by calling 1-877-337-9303.

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