5g home internet - some sites won't load

I called T-mobile tech support and told them about the entry above that mentions the applied content filter. The tech talked to a supervisor and then told me they were not aware of any such thing existing. After much searching and reading articles I was convinced it was related to network security or encryption protocol. I attempted to update the driver for my network adapter, but it said it was up to date. However, Windows Update found 4 other updates that were available for my Windows 11 Pro system. One of them was a cumulative update for the dot NET versions. I ran the four updates and rebooted about 3 times during the installs. Then, my connection to all websites started working. If you can connect to Google, Youtube, and other popular websites, but cannot connect to others, like Walmart.com, try updating all your drivers and applying Windows updates. It worked for me. Good luck.