Can't access back office. http 500 error

[Mr.L]

Hi,

need urgent help. Can't access my shop neither back or front office. I get Http Error 500

 

Problem started  when my shop was very slow I played with caching and when I turn on APC cahing then I got http 500  Error.

 

I saw a server log list and this problem I get:

 

[sat Dec 17 06:27:37.275125 2016] [fastcgi:error] [pid 24136] (104)Connection reset by peer: [client 157.55.39.84:28360] FastCGI: comm with server "/usr/local/fastcgi/cgi-bin/php-cgi" aborted: read failed
[sat Dec 17 06:27:37.275224 2016] [fastcgi:error] [pid 24136] [client 157.55.39.84:28360] FastCGI: incomplete headers (0 bytes) received from server "/usr/local/fastcgi/cgi-bin/php-cgi"
[sat Dec 17 08:00:51.575081 2016] [fastcgi:error] [pid 29635] (104)Connection reset by peer: [client 8.29.198.25:14785] FastCGI: comm with server "/usr/local/fastcgi/cgi-bin/php-cgi" aborted: read failed
[sat Dec 17 08:00:51.575219 2016] [fastcgi:error] [pid 29635] [client 8.29.198.25:14785] FastCGI: incomplete headers (0 bytes) received from server "/usr/local/fastcgi/cgi-bin/php-cgi"
[sat Dec 17 11:00:58.624697 2016] [fastcgi:error] [pid 29665] (104)Connection reset by peer: [client 65.19.138.35:43435] FastCGI: comm with server "/usr/local/fastcgi/cgi-bin/php-cgi" aborted: read failed
[sat Dec 17 11:00:58.624809 2016] [fastcgi:error] [pid 29665] [client 65.19.138.35:43435] FastCGI: incomplete headers (0 bytes) received from server "/usr/local/fastcgi/cgi-bin/php-cgi"

 

My Hosting provider not helping me because on saturday and sunday he doesn't work.