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If a network break has persisted for more than a few minutes, a ping or traceroute will normally respond with the message ICMP error : No route to host and this tells us immediately that there is a network connectivity problem But what if there is no DNS problem and ping tells us that the host is alive Then the natural next step is to verify that the WWW service is actually running on the server host On a Unix-like OS we can simply log onto the server host (assuming it is ours) and check the process table for the httpd daemon which mediates the WWW service ps aux | grep httpd BSD ps -ef | grep httpd Sys V On an NT machine, we would have to go to the host physically and check its status.

CrossReference The section that follows is a crash course in file permissions; we go into greater detail in 13.

If the WWW service is not running, then we would like to know why it stopped working Checking log files to see what the server was doing when it stopped working can provide clues or even an answer Sometimes a server will die because of a bug in the program It is a simple matter to start the service again If it starts and seems to work normally afterwards, then the problem was almost certainly a bug in the program If the service fails to start, then it will log an error message of some kind which will tell us more One possibility is that someone has changed something in the WWW service's.

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If you look at a variety of files and directories from across the system and list them with the ls -l command, you can see different patterns of ownership and permissions. In each case the output from the ls command is giving you several pieces of information: the permissions on the file expressed as a ten-place string, the number of links to the file, the ownership of the file (user and group), the size of the file in bytes, the modification time, and the filename. Of the ten places in the permissions string, the first differs from the others: The last nine can be broken up into three groups of three, representing what the user can do with the file, what members of the group can do with the file, and what others can do with the file, respectively. In most cases, these permissions are represented by the presence or absence of the letters r (read), w (write), and x (execute) in the three positions. So: rwx means permission to read, write, and execute r-- means permission to read but not to write or execute r-x means permission to read and execute but not to write and so on.

Cn consists of / genes (parameters). Let ACni be the mutation step size for the i-th gene of individual Cn. Then, the lognormal self-adaptation of AC n i is

So for example:

configuration file and has left an error behind The server can no longer make sense of its configuration and it gives up The error can be rectified and the server can be restarted What if the server process has not died What if we cannot even log onto the server host The latter would be a clear indication that there was something more fundamentally wrong with the server host Resisting the temptation to simply reboot it, we could then try to test other services on the server host to see if they respond We already know that the ping service is responding, so the host is not completely dead There are therefore several things which could be wrong: - The host is unable to respond (eg it is overloaded) - The host is unwilling to respond (eg a security check denying access to our host).

This file can be read and written by its owner (roger), can be read by members of the group users, and can be read by others.

We can check that the host is overloaded by looking at the process table, to see what is running If there is nothing to see there, the host might be undergoing a denial of service attack (see 9) A look at netstat will show how many external connections are directed towards to host and their nature This might show something that would confirm or deny the attack theory An effective attack would be difficult to prevent, so this could be the end of the line for this particular investigation and the start of a new one, to determine the attacker If there is no attack, we could check that the DNS name service is working on the server-host This could cause the server to hang for long periods of time.

This file is not executable or writable, and can be read only by its owner (roger). Even roger would have to change the permissions on this file to be able to write it.

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