3.1.2 Matrix Server Administration Guide

Chapter 12: Configure Service Monitors 162

FTP Service Monitor

By default the FTP service monitor probes TCP port 21 of the virtual host

address. You can change this port number to the port number configured

for your FTP server. The default frequency of the probe is every 30

seconds. The default time that the service monitor waits for a probe to

complete is five seconds.

The probe function attempts to connect to port 21 and expects to read an

initial message from the FTP server. The message should begin with 220.

If the probe is successful, the monitor sends the string QUIT\n to the

server. If there are no errors, the service status remains Up. If an error

occurs, the status is set to Down.

HTTP Service Monitor

By default, the HTTP service monitor probes TCP port 80 of the virtual

host address. You can change this port number to the port number

configured for your HTTP server. The default frequency for the probe is

every 30 seconds; the default time that the service monitor waits for a

probe to complete is five seconds.

You can also supply a URL (either a directory or a full URL) that will be

read as part of the probe function. The probe attempts to connect to the

HTTP server and read the URL. If the response from the HTTP server is a

success code (200 <= reply < 300), then the service status remains Up. If

the probe does not receive a success code or it takes more than five

seconds to get the reply from the HTTP server, the service status is set to

Down. (You can view the reply code from the Management Console;

select the service monitor, right-click, and select View Last Error.)

SMTP Service Monitor

By default, the SMTP service monitor probes TCP port 25 (sendmail port)

of the virtual host address. You can change this port number to the port

number configured for your SMTP server. The default frequency of the

probe is every 30 seconds. The default time that the service monitor waits

for a probe to complete is five seconds.

The probe attempts to connect to port 25 and expects to read an initial

message from the SMTP server. This message should begin with 220. If

the probe is successful, the monitor sends the string QUIT\n to the SMTP