Comcast.net email servers - temporarily blacklisted IP Address errors

[Martin Cook]

Hello NANOG,

We recently started getting some complaints from customers experiencing an 
error when trying to access their old Comcast.net email accounts with one of 
their email clients (outlook tbird etc.) via POP3 or IMAP. Web based use of 
their email via the Comcast portal is unaffected.

  "ERR [AUTH] Temporarily blacklisted IP Address - try again later"

These customers are previous Residential HSI subscribers of Comcast who have 
since moved to other internet service providers, including ours, and are still 
allowed to use their old email accounts.

There is a web portal based method for attempting to get individual IP 
addresses removed from the "temporary black list". But due to the number of 
reports we have had in a very short period of time we believe an entire range 
of IP's (possibly a /17) has been blacklisted as of last Friday-ish

We're having difficulty resolving this issue through Comcast customer support 
or the Comcast Security assurance team. So I'm looking to see if anyone from 
Comcast or someone who has had this issue before reach out off-list to assist 
with resolving this headache.



Enjoy N91 next week for all the people attending, stop by to attend Jason 
Rokeach's talk on "meshrr: Hierarchical Route Distribution @ Scale w/ 
Kubernetes on Wednesday!" I'm sure he will have some awesome things to show 
everyone.

Thanks,

Martin Cook

Re: AS6461 issues in Montreal

[Martin Cook]

Same here, I'm showing around 3:15 - 3:20 Eastern time our traffic doubled out 
of Montreal.. to somewhat normal levels, no notifications at all from Zayo.

-- Original Message --
From: "Pascal Larivee" 
mailto:pascal.lari...@gmail.com>>
To: "nanog@nanog.org" 
mailto:nanog@nanog.org>>
Sent: 9/24/2021 3:51:36 PM
Subject: Re: AS6461 issues in Montreal

[This email comes from outside of your organization. Please be cautious opening 
or clicking on any attachments or links.]


Just saw the total go back to 800+K now and we are picking up more traffic. No 
updates from Zayo support.

On Fri, Sep 24, 2021 at 2:03 PM Pascal Larivee 
mailto:pascal.lari...@gmail.com>> wrote:
Yes, saw the same thing this morning, They dropped half the internet.
No reply from them on our support ticket.

--
Pascal Larivée


--
Pascal Larivée