How to verify Apache web server status - Parallels Plesk Panel for Linux/Unix.
The name of Apache 2 binary on Debian and SuSE OSes is “apache2,” not “httpd” as it is on Red Hat-based Linux distributions or FreeBSD.
# ps ax | grep httpd | grep -v grep
If not, try to start Apache from Plesk CP or via command line. If you get an error, check /var/log/httpd/error_log (/var/log/apache2/error_log on SuSE and Debian, /usr/local/psa/apache/logs/error_log on FreeBSD)
Make sure that Apache is listening on the both HTTP and HTTPS ports (80/443) on all needed IP addresses:
# netstat -l | grep http
tcp 0 0 *:http *:* LISTEN
tcp 0 0 *:https *:* LISTEN
tcp 0 0 *:http *:* LISTEN
tcp 0 0 *:https *:* LISTEN
