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Hello,
Indeed as Mohsen said you need to first check your Apache/Nginx error logs. The default location of the Apache error logs on CentOS is:
/var/log/httpd/error_log
What you could do is grep for your domain name in the error log:
grep your.subdomain.com /var/log/httpd/error_log
That way you would get all of the entries from the error log for this particular subdomain name.
Hope that this helps! Regards, Bobby