6 Messages
Frequent website security certificate errors - susi.comcast.net redirect to "Activation" page
Been round and round with support and can't seem to get someone who understands the issues. If I get told to "restart" something again I've had it... and then once I restart something I'm told "you're online so we resolved the issue!" No. No you have not and no one seems to have any clue of what is going on.
PLEASE HELP!!!
What happens is when I visit websites, randomly and frequently I get a warning that "This Connection is Not Private" stating there is an invalid security certificate. The security certificate goes to "susi.comcast.net" and when you proceed to the site it is a redirect to a "Welcome to Xfinity" site telling you to download the app and activate internet. The websites are where I get this error are random and sometimes it goes through, sometimes it does not. And it's not the same websites either, that is random too. Many of the websites are standard secure sites that usually have no issues.
I have a personal router, so the Comcast Modem is in bridge mode. However I have tried several times taking it in and out of bridge mode and still have the same issues either way.
To answer the "tech support" standard questions that I always get asked:
1. Yes, my internet is activated
2. Yes, I am connected
3. No, I am not "restarting" unless you have an idea of what the problem actually is
XfinityBenny
Official Employee
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698 Messages
4 months ago
@user_6vdjgz Hello and good afternoon. Thanks for posing and sharing your experience with the community. We appreciate it and are happy to assist. We are a team of experts that you can count on to ensure your internet is working. We all work from home, and know it is vital to have a good connection. Thanks for the troubleshooting so far, you may need to actually reboot the modem and also your internet devices so everything has the latest patches and updates successfully. What devices is this happening on? List the devices, their operating systems, and their latest OS version numbers so we can proceed.
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user_ofjaq0
1 Message
3 months ago
I am seeing the same issue. Please share info if this was resolved. Thanks.
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user_2xm7x5
1 Message
3 months ago
I am having the same issue after installing a new modem from Comcast. Before setup every site visited was being redirected to 'https://susi.comcast.net'. The same access issue was happening during setup because my phone was connected to my router which was getting its internet access through the modem. This resulted in the setup failing until I disconnected from my WiFi and used my cell data to finish the setup. Even after setup some sites would load, but then there are many that would not with an error about the certificate being invalid.
I work in DevOps and after researching the issue a little bit it looks like Comcast has set up something on the modem/gateway that is trying to be helpful in redirecting traffic from your network to their webpage to prevent network access until you to open the xfinity mobile app to finish setting up the modem/gateway. The site it redirects to 'https://susi.comcast.net' is not one that can be found on the web because it does not exist publicly and is only accessible when the modem/gateway has a control of where to send this traffic. I am imagining that this protects a modem from working for just anyone who may decide to take the device and try to use it elsewhere. The extra layer of issues here is that the certificate for the domain is issued by Comodo which may or may not be a certificate authority that your computer's system or browser recognizes.
There are other factors that contribute to this redirect still happening after setup that could be related to browser cert stores, cache, and operating system cert stores, but I won't go into all of those and put everyone to sleep.
To resolve the certificate error part of the issue you will need to add the root certificate from Comodo to your system certificate/keychain. You can see the certificate authority for the cert by viewing the certificate details in your browser. I use Chrome and I would provide a screenshot but the WYSIWYG editor is not allowing it. Click on the 'Not Secure' icon or button to the left of the domain name in the URL/Address bar. Select to view the certificate details. And then go to the details tab to view the certificate chain with susi.comcast.net at the bottom and the certificates that lead back to the root authority.
You can save the root authority for Comodo and import it into your system certificate stores, or you can go to the Comodo website and download the root certificate authority files from them.
The reason this is not a consistent issue for all users is because it depends on the individual system's trusted certificate authorities and if it has the specific Comodo certificate authority file installed. This will allow your sites to finish the redirect without getting hung up on a cert error, but Comcast will need to address issues when the page is still loading even after setup is completed.
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SeattleSheri
New Poster
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3 Messages
1 month ago
I had this issue too and what resolved it was re-adding my (non xfinity) modem through the xfinity app on my phone while connected to cellular.
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user_7s73cw
1 Message
27 days ago
I have the same problem, too, after replacing our modem. Whether the replacement was warranted or not is an open question, but it does give us $200 more buy-in to Comcast.
Persisting across multiple devices (macOS Sonoma and Ventura, iOS and iPad), multiple sites (sometimes including Google and Amazon) and interspersed with random outages. Posting using Verizon personal hotspot.
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