Hi. I have a problem with my web server (Ubuntu 16.04 + ISPconfig 3.1). Every day or two 'apache' hangs and I need to reboot the server. The resources at there moment are in high level, but the server has 4GB of ram and no much traffic. The /var/log/apache/error.php shows this message before to the hang: [mpm_prefork:error] [pid 2178] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Another line that appears ocasinaly: [mpm_prefork:warn] [pid 2178] AH00167: long lost child came home! (pid 2186) I changed the value MaxRequestWorkers to 256 in /etc/apache2/mods-enabled/mpm_prefork.conf (default is 150) but the problem persists. Any idea of what happen? Thanks.