Hello, when I try to navigate to URLs for American Express, Vistaprint, Old Navy, United and some others on my home network, I immediately get a following message below and the reference number changing slightly if you reload the page. 

Access Denied

You don't have permission to access "http://www.united.com/" on this server.

Reference #18.b4a83817.1623410394.2aa7f9f1

This issue has been going on for almost couple of months now, after spending hours on numerous phone calls with various agents at Comcast Customer Service/Advanced Tech Support/Customer Security Team, swapping four modems (initially I was using my own Xfinity Arris Modem, few years old, then bought a new Xfinity compatible one, which I returned and now finally on a second rental from the company) and going through various steps to reboot, restart, clearing cache, turning off XFi Security, tweaking browser settings, I'm still facing the same issue, irrespective of what device/browser/etc. I try it on.  Apparently, no one is able to figure out why this is happening or able to assist in resolving the issue. 

All the websites were working to our knowledge until we realized we couldn't go to United Airlines website or use their app to check our itinerary recently.  The strange part is when the modem is initially setup and activated, the sites do work briefly and then they stop working some time later.  I have read about others facing similar issue and it maybe due to CDN like Akamai could block access to websites.  I checked my IP on their reputation tool and it stated that I have a bad score due to a scanning tool, however I'm not running anything.  I also submitted a request to have them investigate the IP, but have not heard back.  Can someone please help me with this issue?!!! I'm tired of going in circles and just want my internet fully working again like before.

Thank you in advance!

Kedar

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Sample Trace Route 

tracert www.united.com

Tracing route to e2788.x.akamaiedge.net [104.114.0.54]
over a maximum of 30 hops:

  1     1 ms     1 ms     1 ms  10.0.0.1
  2    11 ms    10 ms    10 ms  96.120.25.189
  3    13 ms    15 ms    11 ms  96.110.165.157
  4    11 ms    12 ms    12 ms  te-0-7-0-23-sur01.columbus.in.indiana.comcast.net [68.86.188.81]
  5    12 ms    11 ms    11 ms  162.151.36.253
  6    15 ms    10 ms    11 ms  be-125-ar01.elmhurst.il.chicago.comcast.net [68.86.188.61]
  7    11 ms    12 ms    16 ms  be-32221-cs02.chicago.il.ibone.comcast.net [96.110.40.37]
  8    13 ms    12 ms    12 ms  be-1212-cr12.chicago.il.ibone.comcast.net [96.110.36.38]
  9    13 ms    12 ms    12 ms  be-304-cr13.350ecermak.il.ibone.comcast.net [96.110.38.221]
 10    12 ms    12 ms    16 ms  be-1413-cs04.350ecermak.il.ibone.comcast.net [96.110.35.45]
 11    12 ms    12 ms    11 ms  be-2411-pe11.350ecermak.il.ibone.comcast.net [96.110.33.206]
 12    13 ms    11 ms    10 ms  as16509-2-c.seattle.wa.ibone.comcast.net [50.242.148.94]
 13    17 ms    15 ms    15 ms  ae7.ctl-ord.netarch.akamai.com [23.203.151.207]
 14    11 ms    12 ms    10 ms  a104-114-0-54.deploy.static.akamaitechnologies.com [104.114.0.54]

Trace complete.