The culprit was the php5-fpm process. Restarting it fixed it. Error output from apache: [Mon May 20 15:36:53.945158 2019] [proxy_fcgi:error] [pid 20480:tid 139913676658432] [client 50.57.61.7:62769] AH01067: Failed to read FastCGI header [Mon May 20 15:36:53.945213 2019] [proxy_fcgi:error] [pid 20480:tid 139913676658432] (104)Connection reset by peer: [client 50.57.61.7:62769] AH01075: Error dispatching request to : Looks like someone set up some kind of status checker that locally hits blah.sudoroom.org every second? 2019-05-20 15:39:45 127.0.0.1 blah.sudoroom.org "GET /server-status?auto HTTP/1.1" 200 Was it supposed to inform us that sudoroom.org was down? ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- marc/juul sudo-sys mailing list sudo-sys(a)lists.sudoroom.org https://sudoroom.org/lists/listinfo/sudo-sys