I cannot reach the domain med.umich.edu and this is critical for my health care

Yes, that is the only domain I cannot access. 

and it is critical that I regain access to this domain. Without this access I cannot get to my University of Michigan hospital portal

I would be concerned too if I could not reach my medical hospital portal. Have you had a chance to clear your cache and cookies? 

Yes I have tried the steps of clearing cache and cookies. I can also reproduce this in both Firefox and Chrome and from other computers in my home

@annarbor111 thank you for the update of clearing cache, and attempting from another device. Are you leasing a Xfinity gateway? Our gateways do have advanced security and may believe the site is unsafe, and blocking. 

This feature can be turned off following the steps outlined on this helpful document, under the enabling advanced security steps: https://www.xfinity.com/support/articles/using-xfinity-xfi-advanced-security

We also have a site you can report websites that are being blocked by advanced security, you may need to put this url in an incognito window: https://spa.xfinity.com/help/advanced-security?faq=advanced-security

@annarbor111 thanks for the additional information, appreciate you sending that over. Are you connecting with a VPN, or if you aren't have you attempted to connect with one? 

Have you attempted to connect directly to the modem, instead of running through the additional router? 

I am not connecting via a VPN, and do not have or use a VPN service. Running direct to the modem did not fix it. 

@annarbor111 this is all helpful information to keep ruling out issues that may be causing the block. Have you gone to IP address blacklist site, to see if by chance the IP address is blacklisted and causing the connectivity issue? 

You can go to Google and put in IP address blacklisted to find a site to check. 

The IP address does not appear to be blacklisted. The domain is med.umich.edu, I would be surprised if the University of Michigan hospital was blacklisted. 

@annarbor111 with Xfinity Forums being a public platform, I did want to rule out options that may not be account specific in case another forums' user had similar issues and was searching posts. I'd like to further troubleshoot by accessing your account, and since I will need to gather some information we don't want in our public conversation, when you have time please send a direct message. 

To send a direct message: 

Click "Sign In" if necessary

• Click the "Direct Message" icon in the upper right - it looks like a chat bubble  

• Click the "New message" (pencil and paper) icon just to the right of Conversations

• Type "Xfinity Support" in the "To:" line - do not use the Employee's name!

• Type your message in the text area near the bottom of the window

• Press Enter to send it

To expedite your request, we ask that you please include your name, the account holder name (if different), and the service address