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Two days ago I've noticed that our servers (nginx + php-fpm) stopped working because curl function start return CURLE_COULDNT_RESOLVE_HOST. After reboot everyting become working again. But now, after about a day of work, I've noticed the same error.
When I ssh to a server $ wget http://example.com is working. I can also request http://example.com from php running as cli. But when I try to curl http://example.com from php in web server I get CURLE_COULDNT_RESOLVE_HOST.
I made reboot again and it is working now... But I think that tomorrow I will have to made another reboot.
Any ideas about root cause?
Are you using Ubuntu by any chance?
Ubuntu pushed an update a short time ago to revert the changes they made in yesterday's update which broke the services and required a restart all PHP-FPM processes
https://www.ubuntu.com/usn/usn-3239-2/