I have been searching for a solution for my problem a long time and tried many proposed solutions but to no end yet.
The Problem I have several websites (4) on my webserver using virtual hosts. Most of the time it works fine but sometimes (around once every 5 minutes) the response takes very long (> 30 seconds). When I reload the page, most of the times it responds normally (< 2 secs). It happens on all 4 websites and seems to be happening randomly. It seems to happen on all browser types.
What I tried already I have full control over all parts of the system so I tried many thing to find out where the problem might be. In my PHP application/profiling logs the time between the start of a request and the response is never longer than 1 second. This tells me the problem is not PHP/Mysql related.
The problem occurred when I had a older version of Apache installed and also when I used PHP 5.x. Since I have installed PHP 7 requests responded quicker but only for those requests that had not these very long response times.
I have installed openssl but the problem did occur before I was using SSL requests also.
CPU on the virtual machine never is higher than 20% and used memory never is above 35%. Ethernet throughput seems normal (<500kbps send, <300 kbps receive)
The Apache access and error logs show no abnormal response times
The configuration Microsoft server 2012 R2 standard (Virtual machine) 2 CPU (Westmere E56xx Nehalem-C) 4 GB RAM
Server version: Apache/2.4.23 (win64) (httpd-2.4.23-win64-VC14) PHP 7.0.13 (ZTS) (php-7.0.13-Win32-VC14-x64.zip) MySQL 5.7.12.0 (mysql-installer-web-community-5.7.12.0.msi)
Apache config
LoadModule access_compat_module modules/mod_access_compat.so
LoadModule actions_module modules/mod_actions.so
LoadModule alias_module modules/mod_alias.so
LoadModule allowmethods_module modules/mod_allowmethods.so
LoadModule asis_module modules/mod_asis.so
LoadModule auth_basic_module modules/mod_auth_basic.so
LoadModule authn_core_module modules/mod_authn_core.so
LoadModule authn_file_module modules/mod_authn_file.so
LoadModule authz_core_module modules/mod_authz_core.so
LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
LoadModule authz_host_module modules/mod_authz_host.so
LoadModule authz_user_module modules/mod_authz_user.so
LoadModule autoindex_module modules/mod_autoindex.so
LoadModule dir_module modules/mod_dir.so
LoadModule env_module modules/mod_env.so
LoadModule include_module modules/mod_include.so
LoadModule isapi_module modules/mod_isapi.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule mime_module modules/mod_mime.so
LoadModule negotiation_module modules/mod_negotiation.so
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule setenvif_module modules/mod_setenvif.so
LoadModule ssl_module modules/mod_ssl.so
LoadModule php7_module "c:/php70-13/php7apache2_4.dll"
AddHandler application/x-httpd-php .php
PHPIniDir "C:/php70-13"
LogFormat "%h %l %u %t \"%r\" %>s %b %>D %p" common
<VirtualHost *:80>
ServerAdmin webmaster@aredcard.com
DocumentRoot "****/sources/public"
ServerName *****
ErrorLog "logs/*****-error.log"
CustomLog "logs/*****-access.log" common
# ErrorLog "|bin/rotatelogs.exe -l logs/%Y%m%d-*****-error.log 86400"
# CustomLog "|bin/rotatelogs.exe -l logs/%Y%m%d-*****-access.log 86400" common
LogLevel notice
HostnameLookups Off
<Directory "******/sources/public">
Options FollowSymLinks
AllowOverride All
<RequireAll>
Require all granted
Include conf/Blacklist.conf
</RequireAll>
</Directory>
</VirtualHost>
<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxRequestWorkers 100
MaxConnectionsPerChild 0
</IfModule>
<IfModule mpm_winnt_module>
ThreadsPerChild 100
MaxConnectionsPerChild 0
</IfModule>
