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Hai Kern, can you help me about this error
Certificate error
Hello, this is a known problem. Please delete http2 manually in the configuration file and save it before proceeding.
aaPanel_Kern ok kern, it worked
but why can't the website be accessed now?
aaP_wwnsugianto
Hello, I suggest you check the logs and error logs of the website
Hello, can you add /var/run/nginx-cache to .user.ini in the website directory? Is this a solution?
nothing happened kern, still unable
Whether to restart phpg and apache
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aaPanel_Kern php success to restart & update, but nginx service is failed. and now all website can't be accessed
Hai kern, and now all websites display nginx pages, what should I do... 
Hello, please check if the files in the website directory exist?
aaPanel_Kern Is the file directory in /var/www/html/... ?
at www/wwwroot/domainname there are all the files
aaP_wwnsugianto
Delete this file index.html, check the contents of the index.php file, and then restart the web site. Is it normal?
aaPanel_Kern still the nginx page
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Did you use apt or yum to install nginx? Check the website logs to see if there are access records? Is accessing using the browser's incognito mode the same?
Is the visited domain name added to the website?
aaPanel_Kern hai kern, is using the brwoser's incognito 
aaP_wwnsugianto
Did you use apt or yum to install nginx? Check the website logs to see if there are access records?
Is the visited domain name added to the website?
aaPanel_Kern Is the visited domain name added to the website?
yes
aaPanel_Kern Did you use apt or yum to install nginx?
i use apt
