Failed (101: Unknown error) while requesting certificate status, responder: r3.o.lencr.org

Moving from a v56 box to a brand new v61.1 box. All configuration and content have been replicated on the new box (the new box is NOT built from a backup / restore). SSL certificates have been provisioned and show “signed and valid.” I’m not seeing any obvious problems; all looks okay. Except …

I’m getting these errors in /var/log/nginx/error.log:

2023/04/20 01:00:50 [error] 42854#42854: connect() to [2600:141b:13::17d7:8271]:80 failed (101: Unknown error) while requesting certificate status, responder: r3.o.lencr.org, peer: [2600:141b:13::17d7:8271]:80, certificate: “/home/user-data/ssl/mydomain.com-20230719-1df2511c.pem”

The files that it’s looking for DO exist on the VPS.

Hmmm… Looking at my old v56 box … it has the same errors …