I was having issues accessing TreasuryDirect.gov when I was on my home network. I could access the site when I was on a cellular network but not on Xfinity. After a long and unfruitful call with customer support I realized I would have to solve the problem myself. I found the IP address of the webpage and discovered I could reach the IP address directly from the Xfinity network. I surmised the problem was actually the Xfinity DNS. I switched to the Google DNS and voila I can access the website on the Xfinity network. As a side benefit the Google DNS seems to be faster.
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