title: 503 service unavailable. Apache crashes once in 7-10 days
body: <p>I use Apache server on Ubuntu 14.04. In order redirect all requests from mypage.com to mypage.com:8080/myapp I use mod_proxy. My 000-default.conf looks as follows:</p>
  <pre><code>&lt;VirtualHost *:80&gt;
      # The ServerName directive sets the request scheme, hostname and port that
      # the server uses to identify itself. This is used when creating
      # redirection URLs. In the context of virtual hosts, the ServerName
      # specifies what hostname must appear in the request's Host: header to
      # match this virtual host. For the default virtual host (this file) this
      # value is not decisive as it is used as a last resort host regardless.
      # However, you must set it for any further virtual host explicitly.
      #ServerName www.example.com
  
      ServerAdmin webmaster@localhost
      DocumentRoot /var/www/html
  
      # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
      # error, crit, alert, emerg.
      # It is also possible to configure the loglevel for particular
      # modules, e.g.
      #LogLevel info ssl:warn
  
      ErrorLog ${APACHE_LOG_DIR}/error.log
      CustomLog ${APACHE_LOG_DIR}/access.log combined
      ProxyPass / http://mypage.com:8080/myapp/ retry=0 timeout=10
      ProxyPassReverse / http://mypage.com:8080/myapp/
  
      ServerName mypage.com
  
      # For most configuration files from conf-available/, which are
      # enabled or disabled at a global level, it is possible to
      # include a line for only one particular virtual host. For example the
      # following line enables the CGI configuration for this host only
      # after it has been globally disabled with &quot;a2disconf&quot;.
      #Include conf-available/serve-cgi-bin.conf
   &lt;/VirtualHost&gt;
  </code></pre>
  <p>And that is my ports.conf</p>
  <pre><code># If you just change the port or add more ports here, you will likely also
  # have to change the VirtualHost statement in
  # /etc/apache2/sites-enabled/000-default.conf
  
  Listen 80
  Listen 81
  
  &lt;IfModule ssl_module&gt;
      Listen 443
  &lt;/IfModule&gt;
  
  &lt;IfModule mod_gnutls.c&gt;
      Listen 443
  &lt;/IfModule&gt;
  
  # vim: syntax=apache ts=4 sw=4 sts=4 sr noet
  </code></pre>
  <p>And everything works fine until in a several days I always get 503 Service Unavailable error page. <a href="https://i.stack.imgur.com/ptvIr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ptvIr.png" alt="503" /></a> and this is written in error.log before error occurs</p>
  <pre><code>[Sun Oct 25 21:22:27.779422 2015] [core:error] [pid 14595] [client 38.104.233.252:45239] AH00126: Invalid URI in request GET HTTP/1.1 HTTP/1.1
  [Mon Oct 26 02:30:20.925532 2015] [core:error] [pid 15416] [client 190.252.95.102:53508] AH00126: Invalid URI in request GET: index.php HTTP/1.0
  [Mon Oct 26 08:22:27.771751 2015] [proxy:error] [pid 15402] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
  [Mon Oct 26 08:22:27.774040 2015] [proxy:error] [pid 15402] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
  [Mon Oct 26 08:22:27.774111 2015] [proxy_http:error] [pid 15402] [client 5.28.160.27:48692] AH01114: HTTP: failed to make connection to backend: mypage.com
  [Mon Oct 26 10:55:51.655213 2015] [proxy:error] [pid 15406] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
  [Mon Oct 26 10:55:51.655422 2015] [proxy:error] [pid 15406] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
  [Mon Oct 26 10:55:51.655470 2015] [proxy_http:error] [pid 15406] [client 169.57.5.20:60000] AH01114: HTTP: failed to make connection to backend: mypage.com
  [Mon Oct 26 13:32:00.442031 2015] [proxy:error] [pid 15408] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
  [Mon Oct 26 13:32:00.442356 2015] [proxy:error] [pid 15408] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
  [Mon Oct 26 13:32:00.442413 2015] [proxy_http:error] [pid 15408] [client 217.168.189.15:50222] AH01114: HTTP: failed to make connection to backend: mypage.com, referer: http://mypage.com/admn
  [Mon Oct 26 13:32:12.245050 2015] [proxy:error] [pid 15402] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.1.1:8080 (mypage.com) failed
  [Mon Oct 26 13:32:12.245179 2015] [proxy:error] [pid 15402] AH00959: ap_proxy_connect_backend disabling worker for (mypage.com) for 0s
  [Mon Oct 26 13:32:12.245190 2015] [proxy_http:error] [pid 15402] [client 217.168.189.15:50225] AH01114: HTTP: failed to make connection to backend: mypage.com, referer: http://mypage.com/admn
  [Mon Oct 26 13:34:44.343614 2015] [mpm_prefork:notice] [pid 991] AH00169: caught SIGTERM, shutting down
  [Mon Oct 26 13:36:07.703185 2015] [mpm_prefork:notice] [pid 991] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.11 configured -- resuming normal operations
  [Mon Oct 26 13:36:07.708761 2015] [core:notice] [pid 991] AH00094: Command line: '/usr/sbin/apache2'
  [Tue Oct 27 01:20:23.236327 2015] [mpm_prefork:notice] [pid 991] AH00169: caught SIGTERM, shutting down
  [Tue Oct 27 01:20:24.265160 2015] [mpm_prefork:notice] [pid 3247] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.11 configured -- resuming normal operations
  [Tue Oct 27 01:20:24.265243 2015] [core:notice] [pid 3247] AH00094: Command line: '/usr/sbin/apache2'
  [Tue Oct 27 01:41:17.177723 2015] [mpm_prefork:notice] [pid 3247] AH00169: caught SIGTERM, shutting down
  [Tue Oct 27 01:41:18.219244 2015] [mpm_prefork:notice] [pid 11636] AH00163: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.11 configured -- resuming normal operations
  [Tue Oct 27 01:41:18.219351 2015] [core:notice] [pid 11636] AH00094: Command line: '/usr/sbin/apache2'
  </code></pre>
  <p>After I restart my machine it works fine again. Then in 7-10 days it crashes again. Tried a lots of things in internet but always get this error at most in several weeks. Struggling with already for some months.
  SELinux is disabled.</p>