i get this problem first time since 5 years i use same site same script without any change .
i have a site xxxxxxx.com (php script) use a ip http://22.214.171.124 (example) , i use centos as OS for the server . i use directadmin as panel to manage site config via address http://126.96.36.199:2222 normaly i have 16cpu site can support as 60 000 visitors online without problem , sometimes when more i get message on directadmin panel that cpu reached 100% and site down so i need to restart server and waiting , i understand it's CPU issue.
But from last week , i get a weird thing , the site start to down and up and down and became unreachabl when visiotrs became more than 5000 online , also in same time the ip http://188.8.131.52 of the site not accessible when the site down also http://184.108.40.206/phpmyadmin not working , BUT http://220.127.116.11:2222 is working normal so i can login and i need to access to service monitor to restar HTTPD and the site backs after 15s and may down also after some second if more visitors , ofcourse it is not problem of CPU. i ask server support and they said nothing wrong and all good from theire side .
my question is : is it possible this problem can became from port network ? maybe they downgrade the speed of the port network ?
is possible that hosting provider can limit speed of port 80 ?
what i don't understand is ip of the site and apache http://18.104.22.168(port 80 normal) not works when more than 5000 online , but http://22.214.171.124:2222 panel ip stay works normal when the site down . maybe hosting provider limited or downgraded speed of port 80 ?