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senate25
1st Topic

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Wednesday, September 6th, 2023 8:00 PM

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Please unblock port 465

Why are you blocking an important SMPT port.

Please remove block.

Al [Edited: Personal information]

Question

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Updated 

2 years ago

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flatlander3

Problem Solver

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1.5K Messages

2 years ago

They don't block 465:  https://www.xfinity.com/support/articles/list-of-blocked-ports 

Are you trying to contact to an outbound?  Try port 587 for submit.  465 is pretty much legacy and depreciated these days on most email providers you run into.

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XfinityAlex

Official Employee

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902 Messages

465 is not deprecated, for example Gmail and Yahoo support it.  Comcast supports 465 and 587 to smtp.comcast.net.  If you're talking about 465 to a remote system, that should not be blocked by us.

2 years ago

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flatlander3

Problem Solver

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1.5K Messages

@XfinityAlex​ 465 is depreciated on even you own banner companies like Spectrum/Charter.  Google defines 465 as SSL, and 587 as TLS.  Many other shops just do 587 these days, especially if they aren't carrying legacy.  Not much of a rhyme or reason to it currently.

2 years ago

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XfinityAlex

Official Employee

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902 Messages

@flatlander3​ Yes, they define it as SSL.  That doesn't mean anything about its use or disuse.  465 requires SSL (technically TLS) at connect, and 587 allows for STARTTLS.  TLSv1 is the version of "SSL" that was created after SSLv3.0, and is largely just a title change.  They've since defined TLSv1.3, the most recent revision.

And FWIW:

$ telnet mobile.charter.net 465
Trying 47.43.18.12...
Connected to mobile.charter.net.

Seems to work to me.  If you want to see more clearly, try "openssl s_client -connect mobile.charter.net:465".

As for deprecation: https://datatracker.ietf.org/doc/html/rfc8314 from 2018 seems to state that 465 is not deprecated, and the overlap of ports with IANA has been given an exemption.

2 years ago

XfinityKei

Official Employee

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1.5K Messages

2 years ago

Hello @senate25 Thanks for coming to our community for help with port questions. From our side of things we do not open ports. I have a few links to share with you that can help. The first is how to update your ports https://www.xfinity.com/support/articles/update-your-xfinity-email-settings. 

The second that goes over how to use and set up port forwarding if you ever need it. https://www.xfinity.com/support/articles/port-forwarding-xfinity-wireless-gateway. 

The third link goes over our blocked ports along with the reason. https://www.xfinity.com/support/articles/list-of-blocked-ports. Let us know if you have any questions. 

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