Operations for a Nonsecure Web Server

For a nonsecure web server, the probe connects to the Apache server and performs an HTTP 1.0 HEAD check by sending the HTTP request and receiving a response. In turn, the probe connects to the Apache server on each IP address/port combination.

The result of this query can be either a failure or a success. If the probe successfully receives a reply from the Apache server, the probe returns to its infinite loop and continues the next cycle of probing and sleeping.

The query can fail for various reasons, such as heavy network traffic, heavy system load, and misconfiguration. Misconfiguration can occur if you did not configure the Apache server to listen on all of the IP address/port combinations that are being probed. The Apache server should service every port for every IP address that is specified for this resource.

The following probe failures are considered as complete failures.

• Failure to connect to the server, as the following error message flags, with %s indicating the hostname and %d the port number.

  Failed to connect to %s port %d %s

• Running out of time (exceeding the resource property timeout Probe_timeout) after trying to connect to the server.

• Failure to successfully send the probe string to the server, as the following error message flags, with the first %s indicating the hostname, %d the port number, and the second %s indicating further details about the error.

  Failed to communicate with server %s port %d: %s

When the monitor accumulates two partial failures within the resource property interval Retry_interval, it counts them as one complete failure.

The following probe failures are considered as partial failures:

• Running out of time (exceeding the resource property timeout Probe_timeout) while trying to read the reply from the server to the probe's query.

• Failing to read data from the server for other reasons, as the following error message flags, with the first %s indicating the hostname and %d the port number. The second %s indicates further details about the error.

  Failed to communicate with server %s port %d: %s