thanks again, i made the changes but it doesn't made any change in subdomain behaviour
maybe i made a mistake in copying file & path
i've did like this:
cp /opt/configs/apache/conf/domains/sub.domain.com.conf /opt/configs/apache/conf/customs/sub.domain.com.conf.Modified
is it correct or i misunderstood and did it in a wrong way?
one more thing, there is no "proxy_fcgi_event" in server php settings, i've selected "fcgid_event"