I have made the following file modifications. How can I assure that these changes are not lost when I upgrade ISPconfig? /etc/php5/fpm/pool.d/www.conf: changed "listen = /var/run/php5-fpm.sock" to "listen = 127.0.0.1:9000", because /var/run/php5-fpm.sock doesn't work /etc/nginx/sites-available/ispconfig.vhost: Uncommented phpmyadmin link. Added /roundcube. Changed /webmail to point to roundcube /etc/postfix/main.cf: added smtp_tls_policy_maps /usr/local/ispconfig/interface/ssl: Added my own certificates I know you're usually supposed to modify templates at /usr/local/ispconfig/server/conf_custom, but I can only find a template for php_fpm_pool.conf.master. In this file, it looks like I need to set the variable use_tcp, because I need the following to be true: "<tmpl_if name='use_tcp'>". I cannot figure out how to set "use_tcp" to true. For the other files (ispconfig.vhost and main.cf), I cannot figure out what template files to set to prevent my changes from getting overwritten. Finally, are the ssl certificates I placed in /usr/local/ispconfig/interface/ssl safe? I purchased the ISPconfig manual, but there is no mention of the conf_custom directory or customization in the book.