Apache Technologies 14 Manual do Utilizador descarregar pdf (Página 29)

Chapter 2 Managing Web Technologies 29

Blocking Websites From Your Web Server Cache

If your web server is set up to act as a proxy, you can prevent the server from caching

objectionable websites.

Important: To take advantage of this feature, client computers must specify your web

server as their proxy server in their browser preferences.

You can import a list of websites by dragging it to list of sites. The list must be a text file

with the host names separated by commas or tabs (also known as csv and tsv strings).

Make sure that the last entry in the file is terminated with a carriage return/line feed, or

it will be overlooked.

To block websites:

1 In Server Admin, click Web for the server you want.

2 Click Settings in the button bar.

3 In the Proxy pane, click Enable Proxy.

4 Do one of the following:

• Click the Add button and type the URL of the website you want to block.

• Drag a list of websites (text file in comma-separated or tab-separated format) to the

“Blocked hosts” field.

5 Click Save.

Using Secure Sockets Layer (SSL)

Secure Sockets Layer (SSL) provides security for a site and for its users by

authenticating the server, encrypting information, and maintaining message integrity.

About SSL

The SSL protocol is on a layer below application protocols (HTTP, for example) and

above TCP/IP. This means that when SSL is operating in the server and the client’s

software, all information is encrypted before being sent.

The Apache web server in Mac OS X Server supports SSLv2, SSLv3, and TLSv1. More

information about these protocol versions is available at www.modssl.org.

The Apache server in Mac OS X Server uses a public key-private key combination to

protect information. A browser encrypts information using a public key provided by

the server. Only the server has a private key that can decrypt that information.

When SSL is implemented on a server, a browser connects to it using the https prefix in

the URL, rather than http. The “s” indicates that the server is secure.

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Apache Technologies 14 Manual do Utilizador Página 29