xFinity Router/Gateway is blocking a specific website

ACCESS RESPONSE:  ERR_CONNECTION_TIMED_OUT Message

NOTE:  Running VPN allows me to get to the website in question - always got to the website without running VPN.

I am having a similar problem as this thread:  https://forums.xfinity.com/t5/Your-Home-Network/xFinity-supplied-Router-Gateway-is-blocking-a-specific/td-p/3316288

• My xFinity supplied router started timing out on only one Website (URL) 5 days ago.
• Before then I was able to connect to the website without issue.
• Others can access the websites without any problems.
• I can access the website using my cell phone or connected to another Xfinity router - just can't get to it when on my home Xfinity Router.   Otherwise, I can access a zillion others websites.
• Xfinity Help worked with me for a while and said to contact the website owner.
• My router was turned off and on again multiple times .

I have contacted the site in question and they confirm that they aren't blocking my access.  FWIW - this site houses three of my websites, e-mail, etc. - can't get to any of them unless I run VPN.