blog.torproject.org TLS certificate expired
Websites prove their identity via certificates, which are valid for a set time period. The certificate for blog.torproject.org expired on 8/24/2021.
Serial Number
04:F3:D6:06:68:01:B3:EF:28:AC:EE:1C:F1:73:09:E4:0A:8D
Not After
8/24/2021, 12:05:54 AM (Coordinated Universal Time)
It looks like there is a new cert, so maybe they just need to kick nginx?