Unable to connect to Live WT, the official wiki, and forums when using a VPN

I am in China. Although these three websites are not blocked, they are extremely slow without a VPN, so I usually keep my VPN on when accessing them.

However, since about three days ago, I have found that I can no longer open the web pages at all while connected to the VPN, and it throws a “connection closed” error.

May I ask if this is intentional, or is it a temporary measure to fix website vulnerabilities?