Check the system log，can you see where is the problem?

Code
[Tue May 09 14:16:45.238926 2017] [proxy_fcgi:error] [pid 9178] [client 101.20.95.50:57350] AH01067: Failed to read FastCGI header, referer: http://www.djsj.org/ubbthreads.php?ubb=newuser
[Tue May 09 14:16:45.238983 2017] [proxy_fcgi:error] [pid 9178] (104)Connection reset by peer: [client 101.20.95.50:57350] AH01075: Error dispatching request to : , referer: http://www.djsj.org/ubbthreads.php?ubb=newuser
[Tue May 09 14:16:45.239261 2017] [proxy_fcgi:error] [pid 8052] [client 101.20.95.50:57354] AH01067: Failed to read FastCGI header, referer: http://www.djsj.org/ubbthreads.php?ubb=newuser
[Tue May 09 14:16:45.239284 2017] [proxy_fcgi:error] [pid 8052] (104)Connection reset by peer: [client 101.20.95.50:57354] AH01075: Error dispatching request to : , referer: http://www.djsj.org/ubbthreads.php?ubb=newuser


[Tue May 09 14:30:17.234472 2017] [proxy_fcgi:error] [pid 1400] [client 101.20.95.50:58402] AH01067: Failed to read FastCGI header, referer: http://www.djsj.org/ubbthreads.php?ubb=newuser
[Tue May 09 14:30:17.235358 2017] [proxy_fcgi:error] [pid 1400] (104)Connection reset by peer: [client 101.20.95.50:58402] AH01075: Error dispatching request to : , referer: http://www.djsj.org/ubbthreads.php?ubb=newuser