Website / apache2 hangs suddenly

    Hello


    I have:
    # Ubuntu 14.04 (Upgraded from Ubuntu 12.04)
    # i-mscp 1.2.9
    # php5-fpm selected


    Suddenly my website "domainA.de" is not reachable anymore. The Server ist up and running so i can log in via SSH, FTP etc.
    Another Domain "domainB.de" which is on the same Server is running correctly.


    I dont know which log files can i check.


    I have check file: /var/log/apache2/domainA.de/error.log


    Which has a lot of entries:
    Other Websites dont have those entries...!

    Shell-Script
    1. [Thu Nov 05 22:55:12.838510 2015] [fastcgi:error] [pid 8724:tid 140236411610880] [client 11.111.11.111:53975] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl" aborted: idle timeout (900 sec)[Thu Nov 05 22:55:12.838540 2015] [fastcgi:error] [pid 8724:tid 140236536764160] [client 11.111.11.111:53971] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl" aborted: idle timeout (900 sec)[Thu Nov 05 22:55:12.838664 2015] [fastcgi:error] [pid 8724:tid 140236411610880] [client 11.111.11.111:53975] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl"[Thu Nov 05 22:55:12.838703 2015] [fastcgi:error] [pid 8724:tid 140236536764160] [client 11.111.11.111:53971] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl"[Thu Nov 05 22:55:12.839237 2015] [fastcgi:error] [pid 9802:tid 140236352861952] [client 11.111.11.111:53972] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl" aborted: idle timeout (900 sec)[Thu Nov 05 22:55:12.839297 2015] [fastcgi:error] [pid 9802:tid 140236352861952] [client 11.111.11.111:53972] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl"[Thu Nov 05 22:55:12.839643 2015] [fastcgi:error] [pid 8724:tid 140236336076544] [client 11.111.11.111:53974] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl" aborted: idle timeout (900 sec)[Thu Nov 05 22:55:12.839685 2015] [fastcgi:error] [pid 8724:tid 140236336076544] [client 11.111.11.111:53974] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl"[Thu Nov 05 22:55:12.839989 2015] [fastcgi:error] [pid 8724:tid 140236361254656] [client 11.111.11.111:53973] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl" aborted: idle timeout (900 sec)[Thu Nov 05 22:55:12.840028 2015] [fastcgi:error] [pid 8724:tid 140236361254656] [client 11.111.11.111:53973] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl"[Thu Nov 05 22:55:12.886359 2015] [fastcgi:error] [pid 8724:tid 140236319291136] [client 11.111.11.111:53970] FastCGI: comm with server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl" aborted: idle timeout (900 sec)[Thu Nov 05 22:55:12.886481 2015] [fastcgi:error] [pid 8724:tid 140236319291136] [client 11.111.11.111:53970] FastCGI: incomplete headers (0 bytes) received from server "/var/lib/apache2/fastcgi/php5-fcgi-domainA.de-ssl"

    HDD

    Shell-Script
    1. Filesystem Size Used Avail Use% Mounted on/dev/xvda1 46G 26G 18G 61% /none 4.0K 0 4.0K 0% /sys/fs/cgroupudev 3.9G 4.0K 3.9G 1% /devtmpfs 802M 292K 802M 1% /runnone 5.0M 0 5.0M 0% /run/locknone 4.0G 0 4.0G 0% /run/shmnone 100M 0 100M 0% /run/user


    MEMORY

    Shell-Script
    1. total used free shared buffers cached
    2. Mem: 8017 7423 593 48 252 6221
    3. -/+ buffers/cache: 949 7067
    4. Swap: 4092 0 4092

    Today I got the Problem again:


    It´s just one Webseite. Others work


    Apache Error Log says:


    Shell-Script
    1. 111.111.111.1 - - [10/Nov/2015:13:23:36 +0100] "GET / HTTP/1.1" 301 312 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0"
    2. 111.111.111.1 - - [10/Nov/2015:13:23:36 +0100] "GET / HTTP/1.1" 301 312 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0"
    3. 111.111.111.1 - - [10/Nov/2015:13:23:36 +0100] "GET / HTTP/1.1" 301 312 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0"