Error in Apache log: [Thu Sep 13 20:41:21.623616 2018] [mpm_event:error] [pid 20210:tid 139885312763776] AH00485: scoreboard is full, not at MaxRequestWorkers Current Config File : Server version: Apache/2.4.18 (Ubuntu) Server built: 2018-06-07T19:43:03 Server's Module Magic Number: 20120211:52 Server loaded: APR 1.6.2, APR-UTIL 1.5.4 Compiled using: APR 1.5.2, APR-UTIL 1.5.4 Architecture: 64-bit Server MPM: event threaded: yes (fixed thread count) forked: yes (variable process count) Server compiled with.... -D APR_HAS_SENDFILE -D APR_HAS_MMAP -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) -D APR_USE_SYSVSEM_SERIALIZE -D APR_USE_PTHREAD_SERIALIZE -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT -D APR_HAS_OTHER_CHILD -D AP_HAVE_RELIABLE_PIPED_LOGS -D DYNAMIC_MODULE_LIMIT=256 -D HTTPD_ROOT="/etc/apache2" -D SUEXEC_BIN="/usr/lib/apache2/suexec" -D DEFAULT_PIDLOG="/var/run/apache2.pid" -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" -D DEFAULT_ERRORLOG="logs/error_log" -D AP_TYPES_CONFIG_FILE="mime.types" -D SERVER_CONFIG_FILE="apache2.conf" Current Mpm Config : <IfModule mpm_event_module> StartServers 2 MinSpareThreads 75 MaxSpareThreads 225 ThreadLimit 64 ThreadsPerChild 25 MaxRequestWorkers 300 MaxConnectionsPerChild 0 </IfModule> After going over https this issue is occured. Can you please guide me over that. It's very critical for me Because issue occurred in Live Environment.
What has changed here? What modules are used? 2.4.18 is ancient, but your server is recently rebuilt. Presumably someone is pulling in patches. I would have whoever built this look at improvements related to e.g. bugzilla #61551