📅 Updated: December 10, 2019 (Originally published: May 15, 2018)
Curl Error Number 77 is:
Problem with reading the SSL CA cert (path? access rights?)
After upgrading ca-certificates package, the PHP-FPM has to re-read the /etc/pki/tls/cert.pem old file. A restart is the best way to ensure it does
Solution #1
Restart PHP-FPM:
sudo systemctl restart php-fpm