You can restart any of the available services on the web server at any time. You can restart the following services:
Mail Server (Exim)
DNS/Name Server (BIND)
FTP Server (ProFTPd)
SQL Server (MySQL)
SSH Server (OpenSSH)
HTTP/Web Server (Apache)
POP3 Server (cppop)
IMAP Server (uwimap)
E-Commerce Server (interchange)
Postgresql Server
Servlet Server (tomcat)