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Thursday, September 12th, 2024 4:48 PM

Temporarily blacklisted IP Address

I cannot reliably access my Comcast email via Gmail.  When I go to Gmail Settings/Accounts and Import/Check Mail from other accounts, I get a message:       

Authentication error. Mail from this account has not been retrieved since <time stamp> 

When I look at the details for this I see:

Authentication error.
Server returned error "[AUTH] Temporarily blacklisted IP Address - try again later"

This problem occurs intermittently.

Any idea how to fix this problem?

Expert

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31K Messages

4 months ago

@user_wcbl78 

I cannot reliably access my Comcast email via Gmail.  When I go to Gmail Settings/Accounts and Import/Check Mail from other accounts, I get a message:       

Authentication error. Mail from this account has not been retrieved since <time stamp> 

When I look at the details for this I see:

Authentication error.
Server returned error "[AUTH] Temporarily blacklisted IP Address - try again later"

This problem occurs intermittently.

Any idea how to fix this problem?

Have you tried logging in to https://connect.xifinity.com/appsuite  to check  your email?

5 Messages

I know how to log into my Comcast account to read email and sometimes do.  But much prefer to use gmail as my mail client.

1 Message

same issue here. login to xfinity works. gmail server seems to be blacklisted by comcast

Official Employee

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1.3K Messages

Hello user_wcbl78  Is the error you're showing that the Comcast SMTP is being blocked, or vice versa? This would dictate how we address this. 

 

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1 Message

The error message is precisely this:  "[AUTH] Temporarily blacklisted IP Address - try again later" Other than authorization it happens when doing pop from Gmail for everyone that is complaining. It errors about every four times to one success. So, good luck with an intermittent problem. It may just be doing a pop protocol update on your email servers.  

1 Message

Same here. Has nothing to do with SMTP—this is receiving mail. The POP fetch throws this error on my home computer/network, my work computer/network, doesn't matter how I connect or what my IP is... which seems to indicate Xfinity is seeing Google/Gmail IPs as blacklisted. I have been running this same setup for over 10 years with no issues until the past few months. 90% of the time gmail fetch returns this error. Am about to drop my xfinity email address if this continues.

1 Message

3 months ago

I have the same problem.  Deleting the account in Gmail did not help.  Now, when I try to add my Xfinity account back to the "Check mail from other accounts" list I get this message:

"Server denied POP3 access for the given username and password."  Credentials are correct, and all was working fine until I got the initial blacklisted message.

Official Employee

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1.8K Messages

I went through a similar situation with my Gmail earlier this year, @user_my1x6e. It was really frustrating because I didn't even realize I was missing emails the first few days. I learned that Google will flag other domains from time to time based on user reports, similar to how legitimate email is sometimes incorrectly identified as spam, and they will temporarily blacklist the IP address as a safety precaution. It usually only lasts 2-4 weeks. If you can still access your email through https://xfinityconnect.email.comcast.net and none of your POP3 settings were changed, you may just need to wait it out until Gmail removes the flag, or it times out on its own.

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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

5 Messages

The error message is coming from the Comcast email server indicating that the Gmail IP address is blacklisted and so Comcast will not allow Gmail to fetch my emails.  There is a workaround for the problem.  In Gmail, go to Settings -> See All Settings -> Accounts and Import -> Check mail from other accounts.  Select Check mail now and keep selecting Check mail now until the error goes away and your emails are fetched.  This usually results in emails being fetched after one or two tries.  To me this indicates either that the IP address is being removed from whatever blacklist Comcast is using or that Gmail assigns a different IP address on each fetch attempt and eventually uses one that is not on the Comcast blacklist.

This is a Comcast problem.  Comcast should not be blacklisting Gmal IP addresses.

New Poster

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3 Messages

@ user_wcbl78

Thanks this did work, still its not something I should have to do. The extra time it takes to do these steps, not to mention this doesn't work on my phone, so I have to keep logging into Gmail on a computer to work. We spend so much money on this stuff and always have problems. I have had this issue happen at least once a year. Usually deleting and re adding the account fixes it, but this time its still an issue. 

(edited)

Visitor

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2 Messages

Thank you - this worked for me too.  Fetched 170 emails I didn't realize I was missing.  I agree, this is not something we should have to do.  It worked well for a long time, then stopped.  This is an xfinity issue to solve.  They should be allow-listing the gmail IP addresses. 

New Poster

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3 Messages

2 months ago

Having the same issue. This is ridiculous. I delete the account from Gmail and re-configured it. It worked for a day, now back to the same message and not getting my emails.

Stop asking if we can get our email on your site, we can. But we don't want to cause it [Edited: "Language"]. Its a web interface and we have to log in ever [Edited: "Language"] time and then it doesn't even take us to our email. We have to click on our account then click email. It take a [Edited: "Language"] day. I wish I could get rid of your account and just have gone to Gmail. YOU need to fix this!!! 

(edited)

Visitor

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1 Message

2 months ago

I get the same blacklisted IP address error message on my iPhone mail app that's connected to my comcast email account. I can SEND email but not receive them. Email works fine on webmail, which is very inconvenient. Complete pain! Never had this problem previously. 

Official Employee

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1.9K Messages

 

Hello, JG987 - Thank you for joining the Xfinity Forum community. Have you tried resetting your password since receiving the Authentication error?

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

Regular Visitor

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6 Messages

2 months ago

Same issue, since iOS 18.1 was released a couple of days ago, this issue has been happening to me, on my iPhone 14 Pro Max.  I can't even log into e-mail using the xFinity app on the iPhone.  Only way for me to check e-mail is by going to the www.xfinity.com site and accessing e-mail from my account via the web.  With the Xfinity app on my phone, it just spins forever.  I've tried resetting my password, but nothing changed.  On the Apple mail client on my phone (iOS 18.1), I get the attached error.  I've tried the disable/re-enabling of the 3rd party mail option, I've deleted and recreated the account on my phone, and all of these things only solve the issue for a very short while, and then the error comes back.  My carrier is AT&T

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1 Message

2 months ago

My wife & I both also have this problem. We have missed many emails from friends and family because of it.  Why is this happening? We each have had our 'comcast' email addresses for years.  Now we are, unfortunately, looking at having to transition over to Gmail addresses, solely  This is a huge hassle.  [Edited: "Language"]?

I totally agree with Ben2025's comment above.  When I open Gmail, Gmail opens.  When I 'open' Xfinity email it is multiple steps to finally get to my email. 
I open and close email multiple times a day.  Xfinity makes this a real chore.

This is your doing, your issue, and it is up to you folks to make a fix for it.

(edited)

1 Message

6 days ago

I am having a similar issue. I travel to Canada and when I check Comcast email i get the server code alert notification, same as everyone else. I can NOT access Xfinity email on my phone or IPAD. I can only access on website.

Now, when I go outside of the location I am staying, all my emails download. 

Any suggestions?

Official Employee

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1.7K Messages

Hello user_r3e65s, thank you for reaching out via our Xfinity Community Forums. I understand how frustrating it is to have trouble accessing your Comcast email through Gmail. I've reviewed the details you provided and understand that you're encountering an intermittent "Authentication error" and the message "Temporarily blacklisted IP Address."

This can be quite disruptive, and I apologize for the inconvenience it's causing. The error message, "Temporarily blacklisted IP Address" Error typically indicates that our security systems have detected unusual activity from your IP address. This could be due to multiple failed login attempts, suspicious activity, or even issues with your internet connection.

 

Here's a breakdown of possible fixes and troubleshooting steps when it comes to accessing your email through Gmail, please let us know if you continue to have issues. 

 

1. Check Comcast Email Settings:

  • Third-Party App Access:

    • Enable: In your Comcast email settings, ensure "Third-Party App Access" is enabled. This allows applications like Gmail to connect and retrieve your emails.
    • Note: If recently disabled, you might need to re-add your Comcast email account to Gmail.
  • Two-Factor Authentication (2FA):

    • Review: If you have 2FA enabled, you might need to generate an app password specifically for Gmail. This app password will be used instead of your regular Comcast password when setting up email retrieval in Gmail.

2. Troubleshoot Network Connectivity:

  • Check Internet Connection: Ensure your internet connection is stable and functioning correctly.
  • Wi-Fi Issues: If using Wi-Fi, try connecting to a different network or using a wired connection to rule out Wi-Fi interference.
  • VPN Usage: If using a VPN, temporarily disable it to see if it interferes with Comcast email access.

3. Update Software and Apps:

  • Gmail App: Update the Gmail app on your phone and tablet to the latest version.
  • Operating System: Ensure your phone and tablet are running the latest version of their respective operating systems (iOS, Android).

4. Consider Alternative Solutions:

  • IMAP vs. POP3: Experiment with using IMAP instead of POP3 to retrieve your emails in Gmail. IMAP allows you to access emails from multiple devices without deleting them from the server.
  • Comcast Email App: If you're primarily experiencing issues with the Gmail app, consider using the official website to log in and check your email for a more reliable experience.

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

New Poster

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14 Messages

Going on 15 hours without gmail being able to get my comcast email. I don't have access to gmail desktop to do a manual pull. Absolutely ridiculous! Fix this, Comcast! See comments below. 

1. Check Comcast Email Settings:

  • Third-Party App Access:

    • Enable: In your Comcast email settings, ensure "Third-Party App Access" is enabled. This allows applications like Gmail to connect and retrieve your emails.
    • Note: If recently disabled, you might need to re-add your Comcast email account to Gmail.  ENABLED
    • Review: If you have 2FA enabled, you might need to generate an app password specifically for Gmail. This app password will be used instead of your regular Comcast password when setting up email retrieval in Gmail.  shouldn't matter - xfinity is blocking gmail IP address - that is the issue

2. Troubleshoot Network Connectivity:

  • Check Internet Connection: Ensure your internet connection is stable and functioning correctly. CONNECTION IS GOOD
  • Wi-Fi Issues: If using Wi-Fi, try connecting to a different network or using a wired connection to rule out Wi-Fi interference. no issues with wifi
  • VPN Usage: If using a VPN, temporarily disable it to see if it interferes with Comcast email access. tested with and without vpn - NO DIFFERENCE

3. Update Software and Apps:

  • Gmail App: Update the Gmail app on your phone and tablet to the latest version. LATEST VERSION OF APP
  • Operating System: Ensure your phone and tablet are running the latest version of their respective operating systems (iOS, Android).LATEST VERSION OF IOS (18.2)

4. Consider Alternative Solutions:

  • IMAP vs. POP3: Experiment with using IMAP instead of POP3 to retrieve your emails in Gmail. IMAP allows you to access emails from multiple devices without deleting them from the server. USING POP3 
  • Comcast Email App: If you're primarily experiencing issues with the Gmail app, consider using the official website to log in and check your email for a more reliable experience. N/A - I DON'T WANT TO USE COMCAST EMAIL APP OR INTERFACE

 

(edited)

1 Message

5 days ago

I am having this issue for the past 3 days.  I have had the Comcast address for more than 20 years and now can't access it via Outlook, Thunderbird, or anything else!  This is [Edited: "Language"]
that there is no live person to talk to to fix this!!

Too Big To Fail, my [Edited: "Language"]!

(edited)

Official Employee

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1K Messages

 

user_k44ef4 Have you tried any of the above steps?

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

New Poster

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14 Messages

please comcast, this is not a user issue. this is a comcast internal security settings issue. You are blocking Gmail from picking up messages. Get the security team in here and have them resolve it. Please stop gaslighting your customers. 

1 Message

2 days ago

COMCAST!!!  FIX THIS.  YOU ARE DRIVING US AWAY FROM YOU.  THIS IS ABOUT TO BE THE LAST STRAW!!!   I GET THE SAME ERROR MESSAGE AS EVERYTONE ELSE.  FIX OUR BLACKLISTED IP ADDRESSES!!!!!  UNBLOCK GOOGLE IP'S

Official Employee

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1.5K Messages

 

user_9fjvej If you have a blocked IP address please feel free to contact our Customer Security Assurance Team. Business Hours: 8:00am - 12:00am EST, 7 days a week
Contact: 1-888-565-4329

They have the training and tools to help you. 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
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